Team:TU Darmstadt/Labjournal/Degradation

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Revision as of 04:56, 26 September 2012

Degradation

This page features the work carried out by the degradation team. The main objectives were the production of a BioBrick containing Fusarium solani cutinase or Est13 esterase two enzymes potentially enabling E.coli of PET degradation and over-expression stems for activity screening.

SOE PCR

Week 1 / CW 17

Tuesday, 24.04.12

Production of electrocompetent cells [http://ecoliwiki.net/colipedia/index.php/DH5_alpha DH5alpha] and BL21
Pouring of LB-Agar plates with ampecilin resistance (AMP)
setting of DYT media
Electroporation of BL21 with the following plasmids
- pEST100, carrying a CM-resistance, the genes of phoA, FsC and EstA
- pET26b(+), carrying a Kan-resistance and the gene of [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808026 pNB-Est13]
- pET16, carrying an Amp-resistance , and is needed for our SKV
- transformed Bl21 cells are incubated over night at 37°C in DYT-media and crossed out on LB-Agar plates

Wednesday, 25.04.12

Miniprep of the 3 overnigth Bl21 cultures and concentration meassurement via Nanodrop
- pEST100 = 140 ng/µL
- pET26b(+) = 200 ng/µL
- pET16 = 200 ng/µL

Thursday, 26.04.12

pEST100 and pET26b(+) serve as templates for the following PCRs

Annotation: Every PCR is done in 4 assays à 50 µL, T_A = 60°C, t_a = 35s, t_E = 25 s

PCR on pEST100
gene of interest: Promo-LacO-RBS-Phoa for SKV
primers: SKV a1 up XbaI & SKV a1 lo NdeI
PCR on pEST100
gene of interest: Promo-LacO-RBS-Phoa for SOE PCR with [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808026 pNB-Est13]
primers: SOE A up & SOE a1 lo
PCR on pEST100
gene of interest: Promo-LacO-RBS-Phoa for SOE PCR with FsC
primers: SOE A up & SOE a2 lo
PCR on pEST100
gene of interest: FsC for SOE PCR with Promo-LacO-RBS-Phoa and EstA part1
primers: SOE b2 up & SOE b2 lo
PCR on pET26b(+)
gene of interest: pNB-Est13 part1 for SOE PCR with Promo-LacO-RBS-Phoa and pNB-Est13 part2
primers: SOE b1 up & SOE Est13 mut lo
PCR on pET26b(+)
gene of interest: pNB-Est13 part2 for SOE PCR with pNB-Est13 part1 and EstA part1
primers: SOE Est13 mut up & SOE b1 lo

Agarose gel electrophoresis (Agarose gele elektrophoresis) for qualitiy control

2-5 1.PCR, 6-9 2.PCR, 10-13 3.PCR

2-5 4.PCR, 6-9 5.PCR, 710-13. 6.PCR

Friday, 27.04.12

clean up of 1. PCR on pEST100 from Thursday, 26.04.12 via Ammonium acetate - Ehtanol DNA precipitation, solved in 54 µl ddH₂O
restriction of cleaned up 1. PCR and pET16b with XbaI and NdeI over weekend at 37°C
- Annotation: From now on SKV will be protocolled in SKV wiki.

Week 2 / CW 18

Monday, 30.04.12

SOE PCR
- pNB-Est13 part1 & pNB-Est13 part2, primers: SOE b1 up & SOE b1 lo
- Promo-LacO-RBS-Phoa & FsC, primers: SOE A up & SOE b2 lo
- Annotation: Every PCR is done in 4 assays à 50 µL, T_A = 60°C, t_a = 35s, t_E1 = 20s, t_E1 = 35s
Agarose gel electrophoresis of SOE PCR

SOE PCR of Promo-LacO-RBS-Phoa-FsC worked, [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808026 pNB-Est13] did not due to missing clean up via Agarose gel electrophoresis, precipitation is insufficient, we do it again
PCRs

PCR on pET26b(+)
gene of interest: pNB-Est13 part1 for SOE PCR with Promo-LacO-RBS-Phoa and pNB-Est13 part2
primers: SOE b1 up & SOE Est13 mut lo
PCR on pET26b(+)
gene of interest: pNB-Est13 part2 for SOE PCR with pNB-Est13 part1 and EstA part1
primers: SOE Est13 mut up & SOE b1 lo

Agarose gel electrophoresis
- 1. PCR worked well 2. PCR did not

Wednesday, 02.05.12

PCRs

PCR on pEST100
gene of interest: Promo-LacO-RBS-Phoa for SOE PCR with pNB-Est13
primers: SOE A up & SOE a1 lo
PCR on pET26b(+)
gene of interest: pNB-Est13 part1 for SOE PCR with Promo-LacO-RBS-Phoa and pNB-Est13 part2
primers: SOE b1 up & SOE Est13 mut lo
PCR on pET26b(+)
gene of interest: pNB-Est13 part2 for SOE PCR with pNB-Est13 part1 and EstA part1
primers: SOE Est13 mut up & SOE b1 lo

T_A = 57°C, t_a = 35s, t_E = 25 s

every PCR is performed in 3 batches à 50 µL

Agarose gel electrophoresis

Promega gel extraction
- c(1.PCR)=6 ng/µL
- c(2.PCR)=12 ng/µL
- c(3.PCR)=13 ng/µL
SOE PCR of 2.PCR and 3.PCR in order to form pNB-Est13 for SOE PCR with Promo-LacO-RBS-Phoa and EstA

T_A1 = 60°C, t_a1 = 25 s, t_E1 = 25 s

T_A = 60°C, t_a2 = 25 s, t_E2 = 35 s

Tuesday, 03.05.12

preparative Agarose gel electrophoresis of SOE PCR from yesterday
Gel extraction
- cpNB-Est13 7 ng/µL

Friday, 04.05.12

PCRs

PCR on pEST100
gene of interest: Promo-LacO-RBS-Phoa for SOE PCR with pNB-Est13
primers: SOE A up & SOE a1 lo
PCR on pEST100
gene of interest: EstA part1 for SOE PCR with Promo-LacO-RBS-Phoa and pNB-Est13
primers: SOE c1 up & SOE EstA mut PstI out lo
PCR on pEST100
gene of interest: EstA part1 for SOE PCR with Promo-LacO-RBS-Phoa and FsC
primers: SOE c2 up & SOE EstA mut PstI out lo
PCR on pEST100
gene of interest: EstA part2 for SOE PCR with EstA part1
primers: SOE EstA mut PstI out up & SOE D lo

- annotation: T_A = 60°C, t_a = 25 s, t_E = 35 s
- every PCR is performed in 3 batches à 50 µL
preparative Agarose gel electrophoresis

Week 3 / CW 19

Tuesday 08.05.12

SOE PCR

gene of interest: Promo-LacO-RBS-Phoa-pNBEst13 for SOE PCR with EstA

primers: SOE A up & SOE b1 lo

template: pNB-Est13 from last friday & Promo-LacO-RBS-Phoa from Wednesday, 02.05.12

- annotation: T_A1 = 60°C, t_a1 = 25 s, t_E1 = 35 s
- T_A2 = 60°C, t_a2 = 25 s, t_E2 = 1 min
did not work

Wednesday, 09.05.12

PCR 1

PCR on pET26b(+)
gene of interest: pNB-Est13 part1 for SOE PCR with Promo-LacO-RBS-Phoa and pNB-Est13 part2
primers: SOE b1 up & SOE Est13 mut lo
PCR on pET26b(+)
gene of interest: pNB-Est13 part2 for SOE PCR with pNB-Est13 part1 and EstA part1
primers: SOE Est13 mut up & SOE b1 lo
PCR on pEST100
gene of interest: EstA part1 for SOE PCR with Promo-LacO-RBS-Phoa and pNB-Est13
primers: SOE c1 up & SOE EstA mut PstI out lo
PCR on pEST100
gene of interest: EstA part1 for SOE PCR with Promo-LacO-RBS-Phoa and FsC
primers: SOE c2 up & SOE EstA mut PstI out lo
PCR on pEST100
gene of interest: EstA part2 for SOE PCR with EstA part1
primers: SOE EstA mut PstI out up & SOE D lo

- annotation: T_A = 60°C, t_a = 25 s, t_E = 35 s
- every PCR is performed in 2 batches à 50 µL

Friday, 09.05.12

qualitative Agarose gel electrophoresis

Week 4 / CW 20

Monday, 14.05.12

Gel extraction of remaining PCRs from Wednesday, 09.05.12
- c(pNB-Est13 part1)=24 ng/µL
- c(pNB-Est13 part2)=26 ng/µL
- c(EstA part2)=13 ng/µL
new SOE EstA mut PstI out lo is orderd from Sigma-Aldrich
SOE PCR

gene of interest: pNB-Est13 for SOE PCR with EstA and Promo-LacO-RBS-Phoa

primers: SOE b1 up & SOE b1 lo

template: pNB-Est13 part1 from last friday & pNB-Est13 part2

- annotation: T_A1 = 52°C, t_a1 = 25 s, t_E1 = 35 s
- T_A2 = 57°C, t_a2 = 25 s, t_E2 = 1.15 min
Agarose gel electrophoresis

Tuesday, 15.05.12

[[Gel extraction]9 of SOE PCR from yesterday
- c(pNB-Est13)=24 ng/µL
SOE PCR

SOE PCR
gene of interest: Promo-LacO-RBS-Phoa-pNBEst13 for SOE PCR with EstA
primers: SOE A up & SOE b1 lo
template: pNB-Est13 from yesterday & Promo-LacO-RBS-Phoa from Wednesday, 02.05.12
SOE PCR
gene of interest: Promo-LacO-RBS-Phoa-FsC for SOE PCR with EstA
primers: SOE A up & SOE b2 lo
template: FsC from Thursday, 26.04.12 & Promo-LacO-RBS-Phoa from Wednesday, 02.05.12

- annotation: T_A1 = 52°C, t_a1 = 25 s, t_E1 = 35 s
- T_A2 = 57°C, t_a2 = 25 s, t_E2 = 1.15 min
- each PCR is performed in 2 batches à 50 µL

Wednesday, 16.05.12

SOE PCR of [[Promo-LacO-RBS-Phoa-pNBEst13] did not work but Promo-LacO-RBS-Phoa-FsC worked
Gel extraction
- c(Promo-LacO-RBS-Phoa-FsC)=10 ng/µL

Week 5 / Kw 21

SOE PCR
gene of interest: EstA for SOE PCR with FsC
primers: SOE c2 up & SOE D lo
template: EstA part1 from yesterday & EstA part2 from Monday, 14.05.12

- annotation: T_A1 = 52°C, t_a1 = 25 s, t_E1 =45 s
- T_A2 = 65°C, t_a2 = 25 s, t_E2 = 90 s
qualitative Agarose gel electrophoresis

Gel extraction
- c(EstA for SOE PCR with pNB-Est13)=42 ng/µL
- c(EstA for SOE PCR with FsC)=23 ng/µL

Thursday, 24.05.12

PCR 1

PCR on EstA for SOE PCR with pNB-Est13 from yesterday
gene of interest: EstA for SOE PCR with pNB-Est13
primers: SOE c1 up & SOE D lo
PCR on EstA for SOE PCR with FsC
gene of interest: EstA for SOE PCR with FsC
primers: SOE c2 up & SOE D lo
PCR on pEST100
gene of interest: Promo-LacO-RBS-Phoa for SOE PCR with pNB-Est13
primers: SOE A up & SOE a1 lo
PCR on pEST100
gene of interest: FsC for SOE PCR with Promo-LacO-RBS-Phoa and EstA part1
primers: SOE b2 up & SOE b2 lo

- annotation: T_A = 60°C, t_a = 25 s, t_E =45 s

each PCR is performed in 3 batches à 50 µL

qualitative Agarose gel electrophoresis
- both EstAs worked
- Promo-LacO-RBS-Phoa for SOE PCR with pNB-Est13 worked
Gel extraction
- c(EstA for SOE PCR with pNB-Est13)=39 ng/µL
- c(EstA for SOE PCR with FsC)=20 ng/µL
- c(Promo-LacO-RBS-Phoa for SOE PCR with pNB-Est13)=13 ng/µL

Week 6 / Kw 22

Tuesday, 29.05.12

SOE PCRs

SOE PCR
gene of interest: Promo-LacO-RBS-Phoa-Fsc-EstA
primers: SOE A up & SOE D lo
template: EstA from Thursday, 24.05.12 & Promo-LacO-RBS-Phoa-Fsc from Wednesday, 16.05.12
SOE PCR
gene of interest: Promo-LacO-RBS-Phoa-pNBEst13-EstA
primers: SOE A up & SOE D lo
template: EstA from Thursday, 24.05.12 & Promo-LacO-RBS-Phoa from Wednesday, 02.05.12 & pNB-Est13 from Monday, 14.05.12
SOE PCR
gene of interest: Promo-LacO-RBS-Phoa-pNBEst13 for SOE PCR with EstA
primers: SOE A up & SOE b1 lo
template: Promo-LacO-RBS-Phoa from Wednesday, 02.05.12 & pNB-Est13 from Monday, 14.05.12

- annotation: each PCR is performed in 3 batches à 50 µL
- T_A1 = 52°C, t_a1 = 25 s, t_E1 =45 s
- T_A2 = 65°C, t_a2 = 25 s, t_E2 = 90 s
Agarose gel electrophoresis
- Promo-LacO-RBS-Phoa-Fsc-EstA worked
- Promo-LacO-RBS-Phoa-pNBEst13 worked

Thursday, 29.05.12

Gel extraction
- c(Promo-LacO-RBS-Phoa-Fsc-EstA)= 8 ng/µL
- c(Promo-LacO-RBS-Phoa-pNBEst13)= 13 ng/µL

Due to better results in SKV we stopped our tries in SOE PCR assembly of our total construct BBa_K808032

SKV

Week 1 / CW 17

Tuesday, 24.04.12

Production of electrocompetent cells DH5alpha and BL21
Pouring of LB-Agar plates with ampecilin resistance (AMP)
setting of DYT media
Electroporation of BL21 with the following plasmids
- pEST100, carrying a CM-resistance, the genes of phoA, FsC and EstA
- pET26b(+), carrying a Kan-resistance and the gene of pNB-Est13
- pET16, carrying an Amp-resistance , and is needed for our SKV

Wednesday, 25.04.12

Miniprep of the 3 overnigth Bl21 cultures and concentration meassurement via Nanodrop
- pEST100 = 140 ng/µL
- pET26b(+) = 200 ng/µL
- pET16 = 200 ng/µL

Thursday, 26.04.12

pEST100 and pET26b(+) serve as templates for the following PCR Is

Annotation: Every PCR is done in 4 assays à 50 µL, T_A = 60°C, t_a = 35s, t_E = 25 s

PCR on pEST100
gene of interest: Promo-LacO-RBS-Phoa for SKV
primers: SKV a1 up XbaI & SKV a1 lo NdeI

Agarose gel electrophoresis (Agarose gele elektrophoresis) for qualitiy control

Friday, 27.04.12

clean up of 1. PCR on pEST100 from Thursday, 26.04.12 via Ammonium acetate - Ehtanol DNA precipitation, solved in 54 µl ddH₂O
restriction of cleaned up 1. PCR and pET16b with XbaI and NdeI over weekend at 37°C

Week 2 / CW 18

Monday, 30.04.12

Agarose gel electrophoresis of DNA digestion from Friday, 27.04.12
Only one single band on Agarose gel electrophoresis
- For saveness two single digests are performed at 20 µL batches. One with XbaI and the other with NdeI. Incubation for 2 hours.
Agarose gel electrophoresis of single digests

- Enzymes cut once each, so digest should have worked.

Ligation of PhoA in cut (XbaI / NdeI) pET16b(+)
- Annotation: 30 µL batch, 1:5 ratio, Ligation at 4°C for 2 days till Wednesday, 02.05.12

Week 4/CW 20

Monday, 07.05.

Electroporation of DH5alpha with 5 µl of the ligation which was performed 2 days before.

Restriction digest of the remaining PCR product PhoA with XbaI/NdeI for 1,5h at 37°C Thursday, 26.04.

PhoA is cleaned up by Agarose gel electrophoresis

concentration:7,36 ng/µl,10,6 ng/µl
Ligation of PhoA x pET16b(+) for 2h, at the rate of (Vector/Insert) 1:5, 1:3

Annotation: If it does not say anything else, Ligation is always done in 20µl batches.

Tuesday, 08.05.

Transformation of DH5alpha with PhoA x pET16b(+) was not successfull, so it was performed again Monday, 07.05.
DNA digestion of pET16b(+)
- 100 µl are cut with XbaI/NdeI, incubaton-time: 1,5h at 37°C
- product is cleaned up by Ammonium acetate - Ehtanol DNA precipitation
- concentration: 85 ng/µl

Wednesday, 09.05.

Colony-PCR
- gene of interest: PhoA
- primer:SKV a1 up XbaI, SKV a1 lo NdeI
PhoA was not inserted, but 2 colonies were picked and inoculated in 5 ml LB Amp medium to look at it again due to a test-restriction.

Thursday, 10.05.

Miniprep of PhoA x pET16b(+)
Restriction digest of the Miniprep: PhoA x pET16b(+)
- enzymes: XbaI/NdeI, incubation: 1,5 h, 37°C
- digest shows that PhoA was not inserted
- Ligation is performed again Monday, 07.05.
Amplification of the genes FSC, Est13 and EstA via PCR1
templates:
- FSC: pEST100
- Est13: pET26b
- EstA: product of SOE-PCR
primer:

Friday, 11.05.

an analytic, 1% agarose-gel proves that the amplification of FSC, Est13 and EstA was successfull.
But to amplify Est13 it was used the product of the SOE PCR which had not been cleaned up, so the large Fragments of the SOE-primers might have disturbed the amplification. The PCR of Est13 had to be performed again (Wednesday, 16.05.)

- 1-4= Est13
- 5-8= EstA
- 9-10= FSC
DNA digestion of pET16b(+) to produce template for a new ligation of PhoA
- concentration: 76,3 ng/µl
- enzymes: XbaI, NdeI
- incubation: for 2 days, 37°C
LIgation of PhoA x pET16b(+) cut with XbaI and NdeI is carried out using different rates of Vector and insert:
- ratio vector/insert= 3:1, 1:1, 1:3, 1:5, 1:7, 1:10
- PhoA= 10,6 ng/µl Monday,07.05.
- incubation: 2 days, 4°C

Week5/CW21

Monday, 14.05.

the Restriction digest of pET16b(+) cut with XbaI and NdeI is isolated by Ammonium acetate - Ehtanol DNA precipitation
LIgation of phoA x pET16b(+) is used to transform DH5alpha via Electroporation

Tuesday, 15.05.

Colony-PCR
- primer:
- SKV a1 up XbaI,
- SKV a1 lo NdeI

PhoA is inserted, so 10 clones (1-10) are picked to be grown in 5ml DYT over night.

Wednesday, 16.05.

Miniprep of 10 clones, the plasmid-DNA is isolated out of 3ml culture per clone.
Restriction digest with NdeI and NcoI of the plasmids PhoA x pET16b(+) 1-4, so FSC and Est13 can be added to the construct.
FSC is cut with NdeI and NcoI
- digests are performed in 20µl total volume at 37°C for 1,5h and cleaned up by Agarose gel electrophoresis

PCR1 of EST13
- template: product of SOE-PCR, cleaned up by the Promega-Kit
- primer: SKV b1 up NdeI, SKV b1 lo NcoI
- an analytical Agarose gel electrophoresis is performed

- 1-4 = Est 13

Friday, 18.05.

Ligation of FSC x (phoA x pET16b(+))
- ratio vector/insert: 3:1, 1:1, 1:3
- concentration:
(phoA x pET16b(+))= 3,72 ng/µl
FSC= 12,22 ng/µl

Week 6/CW 22

Monday, 21.05.

Elektroporation of DH5alpha with the Ligation of FSC x (phoA x pET16b(+))
Restriction digest of (phoA x pET16b(+))(150µl,160µl) for the insertion of Est13/FSC
- enzymes: NdeI, NcoI
- incubation: 1,5h, 37°C
- cleaned up via Agarose gel electrophoresis
- the DNA fragment at 600 bp proves that the vector has been cut.
- c(phoA x pET16b(+))= 23,5 ng/µl

Restriction digest of Est13
- cleaned up via Agarose gel electrophoresis
- c(Est13)= 7,7 ng/µl

Tuesday, 22.05.

Ligation of Est13 and (phoA x pET16b(+))
- both components have been cut with NdeI and NcoI Monday, 21.05.
- ratio vector/insert: 1:10, 1:5, 1:3
- incubation: 2h, 25°C
- Electroporation of dH5alpha using the Ligation of Est13 x (phoA x pET16b(+), 5 µl per 100µl cells

Wednesday, 23.05.

colony-PCR
- aim is to check the insertion of Est13
- Primer:SKV b1 up NdeI, SKV b1 lo NcoI
- 8 colonies have been picked and the Agarose gel electrophoresis proves, that Est 13 has not been inserted into (phoA x pET16b(+)

Wednesday, 23.05.

Ligation of FSC and Est13 in (phoA x pET16b(+)
- ratio vector/insert: 1:3, 1:5
- c(templates):Monday, 21.05.
Elektroporation of DH5alpha with Est13 in (phoA x pET16b(+)

Thursday, 24.05.

colony-PCR proves, that Est13 has been inserted into (phoA x pET16b(+))
- plates are covered with colonies, 8 colonies are chosen for colony-PCR
- colony No.5 is chosen to be inoculated in 5µ DYT/Amp medium

[PCR 1] is performed again to amplify FSC and Est13
- products are cleaned up by Agarose gel electrophoresis

Friday, 25.05.

Restriction digest of FSC and Est13 Thursday, 24.05.
- enzymes: NdeI, NcoI
- incubation: 2days, 37°C

week 7/CW 23

Tuesday, 29.05.

Restriction digest of FSC and Est13 is cleaned up via Agarose gel electrophoresis
MIniprep of Est13 x (phoA x pET16b(+) via Promega-Kit
Ligation of FSC x (phoA x pET16b(+))
- ratio vector/insert: 1:3, 1:5, 1:10
- incubation: 2h, 25°C
Electroporation of DH5alpha with 5µl of the LIgaton: FSC x (phoA x pET16b(+)
PCR 1 to amplify EstA, (Thursday, 10.05.)
- 4 assays à 50 µL, T_A = 66°C, t_a = 35s, t_E = 90s
- cleaned up via Kit
- An analytical Agarose gel electrophoresis is performed

Wednesday, 30.05.

Restriction digest of EstA (product of PCR, 80 µl) and Plasmid: (Est13 x phoA x pET16b(+))
- enzymes: EcoRI, NcoI
- incubation: 1,5h, 37°C
- The Agarose gel electrophoresis shows, that two DNA fragments are cut out of the vector (Est13 x phoA x pET16b(+)). This might be a hint that Est13 is not inserted.
- 1-3 = (Est13 x phoA x pET16b(+))
- 4-5 = EstA
- c(EstA) = 6,7 ng/µl
- c(Est13 x phoA x pET16b(+))= 23 ng/µl
Electroporation of FSC x (phoA x pET16b(+) worked well, plates are covered with colonies which are picked to be grown in 5ml DYT/Amp medium over night.

Thursday, 31.05.

Miniprep of the amplified (FSC x phoA x pET16b(+))
- Restriction digest to ligate EstA
- enzymes:NcoI, EcoRI
- incubation: 1,5h, 37°C
to be sure that the plasmid (Est13 x phoA x pET16b(+)) really carries Est13 and PhoA, an analytic PCR1 is performed. Also pEt16b(+) is used as template with different primers.
templates:
- pEt16b(+) Wednesday, 25.04.
- (phoA x pET16b(+)) Wednesday, 16.05.
- (Est13 x phoA x pET16b(+)) Monday,29.05.
primers, used on each template:
- SKV b1 up NdeI, SKV b1 lo NcoI
- SKV a1 up XbaI, SKV a1 lo NdeI
conditions:
- T_A = 66°C, t_a = 35s, t_E = 90s
the Agarose gel electrophoresis shows, that there is no binding-specifity concerning the genes of interest and the primers, but primers have been checked on mistakes.
to solve the problem, the LIgation of FSC and Est13 shall be repeated from the beginning.

Additionally,the decision was to go on with the Ligation of EstA into the Plasmids (Est13 x phoA x pET16b(+)) and (FSC x phoA x pET16b(+)), in case that the PCR was proceeded under wrong conditions.

Friday, 01.06.

Restriction digest of (phoA x pET16b(+))
- enzymes: NcoI, NdeI
- incubation: 1,5 h, 37°C
LIgation of Est13 and FSCx(PhoAxpET16b(+))
- ratio vector/insert: 1:3, 1:5
- c(Est13)= 3 ng/µl
- c(FSC)= 11 ng/µl
- c([[phoA x pET16b(+))= 29 ng/µl
- incubation: over night, 25°C
Restriction digest of (FSCx (PhoA x pET16b(+))
enzymes: NcoI, EcoRI
incubation: 1,5h, 37°C

week 8/CW 24

Monday, 04.06.

restriction of (FSCx(PhoAxpET16b(+)) and (phoAxpET16b(+)) is cleaned up by Agarose gel electrophoresis
- c(FSCx (PhoA x pET16b(+)) = 14 ng/µl
Electroporation of DH5alpha with Ligation: (FSCx PhoAx pET16b(+)), (EST13x PhoAx pET16b(+)) Friday, 01.06

Tuesday, 05.06.

colony-PCR on EST13 & FSC is negative.

Wednesday, 06.06.

Electroporation of DH5alpha with Ligation-assays from 01.06.
Ligation of EstAWednesday,30.05 and the Plasmids (Est13xphoAxpET16b(+)),(FSCxphoAxpET16b(+)) from Monday,04.06.
- ratio vector/insert: 1:3,1:5
- incubation: 2h, 25°C
- Electroporation of DH5alpha with (EstAx Est13x phoAx pET16b(+)) and (EstAx FSCx phoAx pET16b(+))

Friday, 08.06.

No cells are grown on plates, so the plates are incubated for another two days at RT.

week8/ CW24

Monday, 11.06.

all plates are covered with cells, so a colony-PCR is performed on either Est13,FSC or EstA
primer:
- SKV b1 up NdeI, SKV b1 lo NcoI
- SKV b2 up NdeI, SKV b2 lo NCOI
- SKV c1 up NcoI, SKV c1 lo EcoRI
- Every PCR is done in 8 assays à 50 µL, T_A = 57°C, t_a = 35s, t_E = 90 s

Tuesday, 12.06.

Agarose gel electrophoresis shows, that EstA has been inserted in both Plasmids, (Est13x PhoAx pET16b(+)) and (FSCx PhoAx pET16b(+))

colonies No.3,4 (EstAx FSCx PhoAx pET16b(+)) and No.15,16 (EstAx Est13x PhoAx pET16b(+)) seem to be positive on EstA and are picked to be grown in 5ml DYT/Amp medium.
colony-PCR on Est13 and FSC shows a lot of unspecific bands, so cloning of the genes from the beginning has to be dropped.

Wednesday, 13.06.

Miniprep of the clones No. 3,4,15 and 16. Tuesday, 12.06.
- c(EstAx FSCx phoAx pET16b(+))=
- No.3=65,17 ng/µl
- No.4=63,8 ng/µl
- c(EstAx Est13x phoAx pET16b(+))=
- No.15=66,3 ng/µl
- No.16=59,7 ng/µl
for gene-expression, it is performed a Elektroporation of BL21-cells with 1µl of the PLasmid-DNA which has just been isolated.

Friday, 15.06.

Transformation of BL21 worked well
Tributyrinagar plates with 1mM IPTG were generated, to induce the Lac-Promotor of pET16b(+), and to demonstrate the esterase-activity by the lysis of Tributyrin.
afterwards Tributyrinagar plates are inoculated with cells which were transformed by Miniprep No.3,4,15,16 on Wednesday, 13.06.
- incubation: 37°C, 2 days

week9/CW25

Monday, 18.06.

Tributyrinagar plates are covered with cells, but no lysis is visible.
- plates are incubated for another day at 25°C.

Tuesday, 19.06.

no lysis, plates stay incubated at 25°C.

Wednesday, 20.06.

no lysis

Friday, 22.06.

The plasmids No.3,4 (EstAx FSCx PhoAx pET16b(+)) and No.15,16 (EstAx Est13x PhoAx pET16b(+)) are prepared for sequencing.
primer:
(EstAxFSCxPhoAxpET16b(+)):
(EstAxEst13xPhoAxpET16b(+)):

Sequencing was not successfull. It was discovered later, that there was a contamination of the DH5alpha cells with other plasmid-DNA, probably caused by Electroporation. Verlinkung Arne Due to this fact, the isolated plasmids were always mixed up with other plasmids, and sequencing had to fail. The contamination of the cells may have also caused false-positive results of the colony-PCRs.

We suggest that the cutinase FSC has an additional lipase-activity, which causes a lysis of the cell-membrane and may have an selective effect on FSC-negative mutants while cultivating the cells.

BioBricks

Week 1 / Kw 29

Tuesday, 17.07.12

PCR 1

each PCR is performed in 5 batches à 50 µL.

T_A = 57°C, t_A = 30 s, t_E = 2 min

PCR on pEST100
gene of interest: PhoA for designing part BBa_K808028
primers: BBa PhoA up & BBa PhoA down
PCR on pET26b(+)
gene of interest: pNB-Est13 part1 for designing part BBa_K808026 via SOE PCR
primers: BBa Est13 up & SOE Est13 mut lo
PCR on pET26b(+)
gene of interest: pNB-Est13 part2 for designing part BBa_K808026 via SOE PCR
primers: BBa Est13 down & SOE Est13 mut up

Agarose gel electrophoresis for quality control
preparative Agarose gel electrophoresis
Gel extraction of PCR products
- 1. PCR (gene of interest: phoA): c(PhoA)=19 ng/µL
- 2. PCR (gene of interest: pNB-Est13 part1): c(pNB-Est13 part1)=39 ng/µL
- 3. PCR (gene of interest: pNB-Est13 part2): c(pNB-Est13 part2)=40 ng/µL
SOE PCR

gene of interest: pNB-Est13 for designing part BBa_K808028

primers: BBa Est13 up & BBa Est13 down

- Annotation: SOE PCR is performed in 5 batches à 50 µL
- T_A1 = 52°C, t_A1 = 25 s, t_E1 = 75 s
- T_A2 = 57°C, t_A2 = 30 s, t_E2 = 2 min
- stored over night at 10°C

Wednesday, 18.07.12

qualitative Agarose gel electrophoresis of SOE PCR (from Tuesday, 17.07.12)

120718 SOE PCR Est13.jpg

preperative Agarose gel electrophoresis
Gel extraction of SOE PCR produkt
PCR 1

gene of interest: EstA from SKV Date for designing part BBa_K808027

primers: BBa EstA up and BBa EstA down

- Annotation: PCR is performed in 5 batches à 50 µL
- T_A = 57°C, t_A = 25 s, t_E = 75 s
- GC Buffer is used
preparative Agarose gel electrophoresis

120718 EstA mit bba.jpg

Gel extraction of PCR product
- gene of interest: EstA: c(pNB-Est13 part2)=119 ng/µL
- stored in freezer

Thursday, 19.07.12

inoculation of 5 mL DYT-media with 5 µL CAM and DH5alpha carrying pSB1C3 with part BBa_K808025 (FsC)
DNA Digestion of the following parts

1. PhoA from Tuesday, 17.07.12
2. pNB-Est13 fromTuesday, 17.07.12
3. EstA from Wednesday, 18.07.12
4. pSB1C31
5. pSB1C32

- enzymes used: EcorI-HF & PstI-HF / for pSB1C32 SpeI is used instead of PstI
- in NEBuffer 4
- Digestion time: 2 h
adding of Dephosphatase Antarctica from NEB on digested pSB1C3 1 & 2
Ligation into digested and 5' dephosphorylated pSB1C3 1
bacterial transformation by Electroporation of DH5alpha

Friday, 20.07.12

the following Electroporation from Thursday, 19.07.12 worked
- Ligation into digested and 5' dephosphorylated pSB1C3
  - pNB-Est13
  - PhoA
inoculation of 5 mL DYT-media with 5 µL CAM and two positive colonies from each transformation (from pNB-Est13 3 colonies are taken) .
- in addition FsC is already on plate, but to controle it, 2 colony PCRs are performed
Ligation of EstA into digested and 5' dephosphorylated pSB1C3
Electroporation of DH5alpha
Miniprep of inoculated FsC in pSB1C3 (BBa_K808025) from Thursday, 19.07.12 failed
inoculation of 5 mL DYT-media with 5 µL CAM and DH5alpha carrying pSB1C3 with part BBa_K808025 (FsC)
- incubation at 37°C over weekend of transformations and picked colonies

Week 2 / CW 30

Monday, 23.07.12

Colony PCR of picked colonies from Friday, 20.07.12

120723 BBaPhoA BBa PhoA BBa FsC BBa FsC BBa Est13 BBa Est13 BBa Est13.jpg

2-3 PhoA colonies, 4-5 FsC colonies, 6-8 pNB-Est13 colonies
Miniprep of one inoculated colony in DYT-media with CAM from Friday, 20.07.12
- c(PhoA in pSB1C3)=220 ng/µL
- c(pNB-Est13 in pSB1C3)=50 ng/µL
inoculation of 2 x 5 mL DYT-media-CAM with pSB1C3 carrying FsC
second transformation of EstA from Friday, 20.07.12 worked, but too many colonies!
- purity plate is done

Tuesday, 24.07.12

Miniprep of the 2 FsC DYT-media-CAM cultures with pSB1C3 carrying FsC from yesterday
- c(FsC in pSB1C3)=168 ng/µL
purity plate of EstA in pSB1c3 is positive
- colonies picked
- Colony PCR with positive control by amplfifying an SKV-EstA
- Annotation: T_A = 57°C, t_A = 25 s, t_E = 2 min, done with NEB- Phusion so its similiar to PCR 1
- GC Buffer is used

Wednesday, 25.07.12

Agarose gel electrophoresis of Colony PCR
- worked out well

120725 Colony BBaEstA positiv probe auf SKV EstA.jpg

2 EstA colony, 4 EstA from SKV as a control
Miniprep of inoculated 5 ml DYT-media-CAM
- c(EstA in pSB1C3)=350 ng/µL

Thursday, 26.07.12

Sequencing is ordered. The following premixes are used :
- 10 µL of c(PhoA in pSB1C3)=220 ng/µL, 1µL VR, 9 µL ddH₂O
- 10 µL of c(PhoA in pSB1C3)=220 ng/µL, 1µL VF2, 9 µL ddH₂O
- 7 µL of c(FsC in pSB1C3)=168 ng/µL, 1µL VR, 7 µL ddH₂O
- 7 µL of c(FsC in pSB1C3)=168 ng/µL, 1µL VF2, 7 µL ddH₂O
- 5 µL of c(EstA in pSB1C3)=350 ng/µL, 1µL VR, 9 µL ddH₂O
- 5 µL of c(EstA in pSB1C3)=350 ng/µL, 1µL VF2, 9 µL ddH₂O
- 5 µL of c(pNB-Est13 in pSB1C3)=50 ng/µL, 1µL VR, 9 µL ddH₂O
- 5 µL of c(pNB-Est13 in pSB1C3)=50 ng/µL, 1µL VF2, 9 µL ddH₂O
in order to prepare DMSO stocks and Minipreps 5 mL DYT-media-CAM are inoculated with following colonies containing
- pNB-Est13 in pSB1C3
- PhoA in pSB1C3
- FsC in pSB1C3
- EstA in pSB1C3
- Annotation: incubation is done at 37°C over night

Friday, 27.07.12

inoculated pNB-Est13 in pSB1C3 from Thursday, 26.07.12 has not grown over night
- new colony pcked from plate and incubated in 5 mL DYT-media-CAM at 37°C over night
Miniprep of 3 mL from the following over night DYT-media cultures from Thursday, 26.07.12
- c(PhoA in pSB1C3)=440 ng/µL
- c(pNB-Est13 in pSB1C3)=450 ng/µL
- c(FsC in pSB1C3)=90 ng/µL

Week 3 / CW 31

Monday, 30.07.12

bacterial transformation by Electroporation of DH5alpha with c(pNB-Est13 in pSB1C3)=50 ng/µL from Monday, 23.07.12

Tuesday, 31.07.12

no results in sequencing our BioBricks / parts from Thursday, 26.07.12 except for FsC in pSB1C3
new Colony PCR(similar to PCR 2) is done on
- PhoA in pSB1C3
- FsC in pSB1C3
- EstA in pSB1C3
- Annotation: T_A = 57°C, t_A = 25 s, t_E = 2 min
- 1 batch à 50 µL per part
no signal on qualitative Agarose gel electrophoresis
- Trouble shooting (see discussion below)

Trouble shooting

Symptoms
- very much transformants on crossed out plates after bacterial transformation by Electroporation
- at first Colony PCR is positive
- Minipreps result in very high yields (exceeding >200 ng/µL)
- second Colony PCR is negative
- sequencing failed
- BUT FsC in pSB1C3
  - has had not very much transformants
  - has had a seuqencing result
  - its Minipreps resulted in medium concentrations, settling around 90 ng/µL

Diagnosis:
- our bacterial transformation is done by Electroporation
- therefor we use electroporation cuvettes, stored in DNA precipitating liquids like isopropanol or ethanol after being washed out.
- long before we started these electroporation cuvettes were in use.
- if not washed out carefully, DNA debris (like vectors and Inserts) accumulates in these storage liquids, due to precipitation
- when an Electroporation is performed with one of these cuvettes, probably containing only little DNA debris, the cells get transformed with numbers of different precipitated plasmids
- these plasmids contain a variety of resistances, reaching from CAM over KAN to Amp, allowing even "wrong" transformants to grow on selective media
- after a short period of time, bacterial colonies start to seperate and repel their plasmids, selecting only the most "comfortables"
- probably our plasmids, containing big genes on ligated vectors, are pushed out during this phase of selection
- this slow decrease of plasmid could explain the missing second positive signal of Colony PCR

Strategy
- switching our method from Electroporation to Heatshock transformation

Wednesday, 01.08.12

due to change of strategy the following PCR 1s are performed

PCR on pEST100
gene of interest: PhoA BioBrick for assembly of part BBa_K808028
primers: BBa PhoA up & BBa PhoA down
PCR on pEST100
gene of interest: EstA part1 for SOE PCR of EstA (BBa_K808027)
primers: BBa Est A up & SOE EstA mut PstI out lo
PCR on pEST100
gene of interest: EstA part2 for SOE PCR of EstA (BBa_K808027)
primers: BBa EstA mut up & BBa EstA down
PCR on pET26b(+)
gene of interest: pNB-Est13 part1 for SOE PCR of pNB-Est13 (BBa_K808026)
primers: BBa Est13 up & BBa Est13 mut lo
PCR on pET26b(+)
gene of interest: pNB-Est13 part2 for SOE PCR of pNB-Est13 (BBa_K808026)
primers: BBa Est13 lo & BBa Est13 mut up

- Annotation: every PCR is performed in 3 batches à 50 µL
- T_A = 57°C, t_A = 25 s, t_E = 75 s
due to time pressure there will be no qualitative but only preperative Agarose gel electrophoresis
- PhoA only on analytical scale but on same Agarose gel electrophoresis with EstA part1

120801 soe pcr esta1 pcr phoa.jpg

1 cut out EstA part1, 2 PhoA

120801 soe pcr est131 est132.jpg

2 cut out pNB-Est13 part1, 3 cut out pNB-Est13 part2

120801 soe pcr esta2.jpg

cut out EstA part2
Gel extraction of EstA part1, EstA part2, pNB-Est13 part1 and pNB-Est13 part2
- c(EstA part1)=19 ng/µL
- c(EstA part2)=110 ng/µL
- c(pNB-Est13 part1)=45 ng/µL
- c(pNB-Est13 part2)=48 ng/µL
SOE PCRs

SOE PCR
gene of interest: EstA
primers: EstA part1 & EstA part2
SOE PCR
gene of interest: pNB-Est13
primers: pNB-Est13 part1 & pNB-Est13 part2

- as a control a PCR is performed on EstA part2
- Annotation: SOE PCR is performed in 3 batches à 50 µL
- T_A1 = 52°C, t_A1 = 30 s, t_E1 = 75 s
- T_A2 = 57°C, t_A2 = 30 s, t_E2 = 75 s
- stored over night at 10°C
qualitative Agarose gel electrophoresis

120801 SOE PCR Est13 EstA EstApart2 kontrolle.jpg

2 pNB-Est13, 3 ESTA, 4EstA part2
PCR Clean up by Promega Kit of PhoA, pNB-Est13, EstA
DNA Digestion of the following parts

- enzymes used: EcorI-HF & PstI-HF
- in NEBuffer 4
- each digestion is performed in a 60 µL batch
- Digestion time: 1.5 h

Thursday, 02.08.12

Ligation into digested and 5' dephosphorylated pSB1C3
- pNB-Est13
- PhoA
- EstA
- Annotation: Ligation is performed in a 20 µL batch
- digested pSB1C3 still availabe from Thursday, 19.07.12
- 1:5 & 1:10 ratio
- incubation at room temperature for 30 min
Heatschock transformation of DH5alpha with our ligation batches
incubation over night at 37°C

Friday, 03.08.12

transformation succeeded
- colonies picked to inoculate 5 ml DYT-media-CM

Saturday, 04.08.12

Miniprep of picked colonies
- c(PhoA in pSB1C3)=227 ng/µL
- c(pNB-Est13 in pSB1C3)=148ng/µL
- c(EstA in pSB1C3)=227 ng/µL
test DNA Digestion with EcoRI-HF and PstI-HF
PCR 2 on preped plasmids with primers VR & VF2, and the respective BBa primers

T_A = 60°C, t_a = 35s, t_E = 25 s

- XylH in pSB1C3 serves as a control in digestion and PCR 2
qualitative Agarose gel electrophoresis 1% agarose

120804 Verdau PhoA, EstA, Est13, PCR auf EstA, Est 13, PhoA, Kontrolle auf Insert und Vektor.jpg

digestion: 2 PhoA, 3 EstA, 4 pNB-Est13 PCR: 6 EstA with BBa primers, 7 EstA with VR & VF2, 8 pNB-Est13 with BBa primers, 10 pNB-Est13 with VR & VF2, 11 PhoA with BBa primers, 12 PhoA with VR & VF2
tests succeeded
- Sequencing of the following parts
  - c(PhoA in pSB1C3)=227 ng/µL
  - c(pNB-Est13 in pSB1C3)=148ng/µL
  - c(EstA in pSB1C3)=227 ng/µL
Annotation: failure in mixing sequencing premixes
retransformation of DH5alpha by Heatshock transformation with the following plasmids with 1 µL each
- c(PhoA in pSB1C3)=227 ng/µL
- c(pNB-Est13 in pSB1C3)=148ng/µL
- c(EstA in pSB1C3)=227 ng/µL

Week 4 / Kw 32

Assembly of our composite part RBS-PhoA-His6tag-pNBEst13-Myctag-EstA (BBa_K808030) is reached by synthesis (from GENEART) of 2 different gene parts:

bba prefix-PhoA-His6tag-pNBEst13-BsaI site
BsaI-Myctag-EstA- bba suffix
the RBS will be added by PCR with primers XbaI Rbs Phoa up (ignoring the bba prefix but adding an XbaI site upstream of the RBS) & Est13 Bsa1 lo, ignoring the bba prefix but adding an XbaI site upstream of the RBS and for the downstream part primers EstA Bsa1 up andBBa EstA down are used
both products can be assembled by using BsaI. An restriction enzyme, with an restriction site in a defined distance to its recognition site

Monday, 06.08.12

Heatshock transformation of DH5alpha with 1 µL synthesis products (c=100 ng/µL):
- bba prefix-PhoA-His6tag-pNBEst13-BsaI site
- BsaI-Myctag-EstA- bba suffix
DNA Digestion of 10 µL = 1 µg of both synthesis products
- bba prefix-PhoA-His6tag-pNBEst13-BsaI site digested with EcoRI-HF and BsaI-HF in a 50 µL batch
- BsaI-Myctag-EstA- bba suffix digested with BsaI-HF and PstI-HF in a 50 µL batch
preparative Agarose gel electrophoresis
Failure due to overlooked additional PstI site in GENEART Vectors
inoculation of 5 ml DYT-media-CAM with retransformations from Saturday, 04.08.12
- PhoA in pSB1C3
- pNB-Est13 in pSB1C3
- EstA in pSB1C3
incubation at 37°C over night

Tuesday, 07.08.12

Colony PCR on 4 colonies of each transformation of synthesis product from Monday, 06.08.12
- Annotation: PCR is done with house-taq, similar to PCR 2
- T_A = 57°C, t_A = 30 s, t_E = 90 s
Colony PCR succeeded
- from bba prefix-PhoA-His6tag-pNBEst13-BsaI site colonies 5, 2, 11 are picked
- from BsaI-Myctag-EstA- bba suffix colonies 1, 10, 16 are picked
inoculation of 5 ml DYT-media-KAN with colonies
incubation over night at 37°C
inoculated 5 mL cultures from Monday, 06.08.12 are stored at 4°C

Wednesday, 08.08.12

Miniprep of following 5 mL cultures
- from Monday, 06.08.12
  - c(PhoA in pSB1C3)=90 ng/µL
  - c(pNB-Est13 in pSB1C3)=221 ng/µL
  - c(EstA in pSB1C3)=202 ng/µL
- from Tuesday, 07.08.12
  - bba prefix-PhoA-His6tag-pNBEst13-BsaI site
    - colony 2 c=438 ng/µL
    - colony 5 c=509 ng/µL
    - colony 11 c=291 ng/µL
  - BsaI-Myctag-EstA- bba suffix
    - colony 1 c=381 ng/µL
    - colony 10 c=420 ng/µL
    - colony 16 c=263 ng/µL
DNA Digestion
- of bba prefix-PhoA-His6tag-pNBEst13-BsaI site colony 11
  - performed in a 40 µL batch
  - BsaI and EcoRI are used
  - digestion for 3 h
- of BsaI-Myctag-EstA- bba suffix
  - performed in a 40 µL batch
  - BsaI and SpeI are used
  - digestion for 3 h
preperative Agarose gel electrophoresis

120808 Restriktion mit E BsaI PhoA Est13 und bsai s EstA.jpg

3-4 cut out bba prefix-PhoA-His6tag-pNBEst13-BsaI site, 5-6 cut out BsaI-Myctag-EstA- bba suffix
Gel extraction
- c(bba prefix-PhoA-His6tag-pNBEst13-BsaI site)= 8 ng/µL
- c(BsaI-Myctag-EstA- bba suffix)= 26 ng/µL
ligation of both inserts in pSB1C3 2 from Thursday, 19.07.12
- 1:5:5 ratio is performed in two 20 µL batches (one incubated at 4°C, the other at room temperature over night)
new sequencing is ordered of the following plasmids
- PhoA in pSB1C3
- pNB-Est13 in pSB1C3
- EstA in pSB1C3
  - general premix:
    - 5 µL plasmid
    - primers VF2 & VR, 1.5 µL each
    - 9 µL ddH₂O

Thursday, 09.08.12

Heatshock transformation of DH5alpha with 10 µL of each ligation batch from yesterday

Friday, 10.08.12

transformation from yesterday suceeded
- one colony per plate (1:5:5 & 1:10:10 at room temperature and 1:5:5 & 1:10:10 at room 4°C)is picked for inoculation of 5 mL DYT-media-CAM

Saturday, 11.08.12

Miniprep of picked colonies from yesterday
- testing ligation by DNA Digestion of plasmids with EcorI-HF & PstI-HF
Colony PCR on picked colonies
- Annotation: T_A = 55°C, t_A = 25 s, t_E = 2 min, done with house-taq so its similiar to PCR 2
- primers: VR & VF2
Ligation and transformation succeeded

120811 PCR (VR,VF2) und Verdau (EcoRI,PstI) auf BBa Gesamt von Geneart.jpg

2-5 bba prefix-PhoA-His6tag-pNBEst13-Myctag-EstA- bba suffix running at round about 3 kb

Week 5 / CW 33

Monday, 13.08.12

Preparation for designing part BBa_K808032 which is an arabinose regulated RBS-PhoA-His6tag-pNBEst13-Myctag-EstA
in order to add RBS upstream of PhoA of bba prefix-PhoA-His6tag-pNBEst13-BsaI site the following PCRs are performed

PCR 1 on bba prefix-PhoA-His6tag-pNBEst13-BsaI site, as a template the pure synthesis product is used
T_A = 57°C, t_A = 25 s, t_E = 2 min
primers: XbaI Rbs Phoa up & Est13 Bsa1 lo
PCR 1 on BsaI-Myctag-EstA- bba suffix, as a template the pure synthesis product is used
T_A = 57°C, t_A = 25 s, t_E = 2 min
primers: EstA Bsa1 lo & BBa EstA down
PCR 3 on preped colony (1:5:5 room temperature from Friday, 10.08.12)
T_A = 57°C, t_A = 25 s, t_E = 2 min
primers: XbaI Rbs Phoa up & BBa EstA down

- Annotation: each PCR is performed in 4 batches à 50 µL
2 qualitative Agarose gel electrophoresis

120813 PCR 1-4 RBSPE 5-8 EXN-Myc-Est 9-12.jpg

2-5 bba prefix-RBS-PhoA-His6tag-pNBEst13-BsaI, 6-9 BsaI-Myctag-EstA-bba suffix

120813 PCR Q5 auf bba gesamt konstrukt.jpg

2-4 bba prefix-RBS-PhoA-His6tag-pNBEst13-Myctag-EstA-bba suffix
PCRs succeeded
PCR clean up of 1.-3. PCR
DNA Digestion of pSB1C3 carrying RFP part ????
- enzymes used: XbaI & PstI
- performed in 100 µL batch
DNA Digestion of part BBa_K808000 (pSB1C3 carrying Arabinose inducible promotor)
- enzymes used: SpeI & PstI
- performed in 100 µL batch
preparative Agarose gel electrophoresis
- c(1.PCR)= 147 ng/µL
- c(2.PCR)= 133 ng/µL
- c(3.PCR)= 96 ng/µL
- c(cut S/P BBa_K808000: Arabinose inducible promotor) possibility 1= 14 ng/µL
- c(cut S/P BBa_K808000: Arabinose inducible promotor) possibility 2= 14 ng/µL
- c(cut X/P pSB1C3 carrying RFP)=20 ng/µL
Ligation at 4°C over night of the following combinations:

1.PCR & 2.PCR in pSB1C3 carrying RFP
3.PCR in pSB1C3 carrying RFP
1.PCR & 2. PCR in BBa_K808000 possibility 1
3.PCR in BBa_K808000 possibility 1
1.PCR & 2. PCR in BBa_K808000 possibility 2
3.PCR in BBa_K808000 possibility 2

Tuesday, 14.08.12

Heatshock transformation of ligation batches 1-6 from yesterday

Wednesday, 15.08.12

transformation succeeded
inoculation of 5 mL DYT-media-CAM of the following colonies
- colony 1.1
- colony 2.1
- colony 2.2
- colony 3.1
- colony 4.1
- colony 4.2
- colony 5.1
- colony 5.2
- colony 6.1
- colony 6.2
  - incubation over night at 37°C
Colony PCR on colonies 1.1-6.2 with house-taq
- primers: VR & VF2

Thursday 16.08.12

Miniprep of colonies from yesterday
DNA Digestion of preped colonies with EcorI-HF & PstI-HF
- incubation for 1.5 h at 37°C
qualitative Agarose gel electrophoresis
- FAILURE, because bands on gel are inconsistent

120816 Testrestriktion der pSB1C3 mit e und p colony platten 1 - 6.jpg

2 colony 1.1, 3 colony 2.1, 3 colony 2.2, 4 colony 3.1, 5 colony 4.1, 6 colony 4.2, 7 colony 5.1, 8 colony 5.2
for further information see discussion below
new inoculation of 5 mL DYT-media-CAM of Colonies 1.1 - 5.2

Trouble shooting

What should have been transformed:

colony 1.1: 1.PCR & 2.PCR in pSB1C3
- should be RBS-PhoA-His6tag-pNBEst13-Myctag-EstA (BBa_K808030) in pSB1C3 (length: ~ 3.1 kb)
colony 2.1: 3.PCR in pSB1C3 upstream of part BBa_K808000 (Arabinose inducible promotor) possibility 1
- should be Arabinose regulated RBS-PhoA-His6tag-pNBEst13-Myctag-EstA (BBa_K808032) in pSB1C3 (length: ~ 4.3kb)
colony 2.2: similar to colony 2.1
colony 3.1: 3.PCR in pSB1C3 upstream of part BBa_K808000 (Arabinose inducible promotor) possibility 2
- should be Arabinose regulated RBS-PhoA-His6tag-pNBEst13-Myctag-EstA (BBa_K808032) in pSB1C3 (length: ~ 4.3kb) like colony 2.1
colony 4.1: 3.PCR in pSB1C3
- should be RBS-PhoA-His6tag-pNBEst13-Myctag-EstA (BBa_K808030) in pSB1C3 (length: ~ 3.1 kb)
colony 4.2: similiar to colony 4.1
colony 5.1: 1.PCR & 2.PCR in pSB1C3 upstream of part BBa_K808000 (Arabinose inducible promotor) possibility 1
- should be Arabinose regulated RBS-PhoA-His6tag-pNBEst13-Myctag-EstA (BBa_K808032) in pSB1C3 (length: ~ 4.3kb)
colony 5.2: similar to colony 5.1

Conclusion:

estimated gene length was aorund 4,3 kb (colony 5.1, 5.2, 2.1, 2.2 = part BBa_K808032) or 3,1 kb (colony 1.1, 4.1, 4.2 part BBa_K808030)
digestion with EcoRI-HF & PstI-HF of all ligations from Thursday 16.08.12 in part BBa_K808000 (Arabinose inducible promotor) possibility 1 shows bands at round about 3 - 3.5 kb
when digested with same enzymes of ligations into part BBa_K808000 (Arabinose inducible promotor) possibility 2, bands are shown at round about 1 - 1.5 kb
this leads to our concluison that BBa_K808000 (Arabinose inducible promotor) possibility 1 was the not digested DNA band, because resulting gene length of cut insert correlates with length of BBa_K808000 (Arabinose inducible promotor)
for a sharper solution an Agarose gel electrophoresis with 0.5 % agarose is performed for digestions of colonies 1.1, 3.1, 4.1, 4.2 plus batches from Colony PCR from Wednesday, 15.08.12

120816 Colony 1.1 3.1 4.1 4.2 Colony Pcr 1-8.tif

2-5 colonies 1.1, 3.1, 4.1, 4.2, 6 - 13 colony 1.1, 2.1, 2.2, 3.1, 4.1, 4.2, 5.1, 5.2

Friday, 17.08.12

the image above means that:
- colony 5.1, 5.2, 2.1, 2.2 are only carrying part [[BBa_K808000 which encodes for the arabinosis inducable promotor
- but colony 1.1, 2.1, 2.2 are carrying 1.PCR & 2.PCR or 3.PCR in pSB1C3
Miniprep of named colonies in liquid DYT-culture from Thursday 16.08.12
- half culture is preped, half culture serves for 10% DMSO stocks
- c(1.1: BBa_K808030)= 81 ng/µL
- c(4.1: BBa_K808030)= 128 ng/µL
- c(4.2: BBa_K808030)= 79 ng/µL
- c(2.1: BBa_K808000)= 90 ng/µL
- c(2.2: BBa_K808000)= 78 ng/µL
- c(5.1: BBa_K808000)= 64 ng/µL
- c(5.2: BBa_K808000)= 62 ng/µL
for BioBrick assembly we perform a DNA Digestion of
- BBa_K808000 (colony 1.1, 4.1, 4.2), with EcoRI / SpeI, serves as upstream part
- BBa_K808030 (colony 5.1, 5.2, 2.1, 2.2), with EcoRI / XbaI, serves as downstream part
preperative Agarose gel electrophoresis
Gel extraction
- downstream part
- c(1.1: BBa_K808030)= 21.5 ng/µL
- c(4.1: BBa_K808030)= 54 ng/µL
- c(4.2: BBa_K808030)= 58 ng/µL
- upstream part
- c(2.1: BBa_K808000)= 12 ng/µL
- c(2.2: BBa_K808000)= 11 ng/µL
- c(5.1: BBa_K808000)= 10 ng/µL
- c(5.2: BBa_K808000)= 5 ng/µL
ligation of upstream infron of downstream part
- colony 5.1 (BBa_K808000) in colony 1.1 (BBa_K808030)
- colony 2.2 (BBa_K808000) in colony 4.2 (BBa_K808030)
- colony 2.1 (BBa_K808000) in colony 4.1 (BBa_K808030)
inoculation of 5 mL DYT-media-CAM of the following colonies
- colony 1.1
- colony 2.1
- colony 2.2
- colony 3.1
- colony 4.1
- colony 4.2
- colony 5.1

Week 6 / CW 34

Monday 20.08.12

Miniprep of incoucaltes colonies from Friday, 17.08.12
- c(1.1: BBa_K808030)= 54 ng/µL
- c(4.1: BBa_K808030)= 74 ng/µL
- c(4.2: BBa_K808030)= 60 ng/µL
- c(2.1: BBa_K808000)= 47 ng/µL
- c(2.2: BBa_K808000)= 42 ng/µL
- c(5.1: BBa_K808000)= 56 ng/µL
sequencing of
- colony 1.1 using VR & VF2, 1.5 µL each
- colony 5.1 using VR, SOE EstA mut lo, SOE EstA mut up & VF2, 1.5 µL each

Tuesday 21.08.12

Ligation of BBa_K808000 upstream of BBa_K808032 in pSB1C3 ( to design BBa_K808032) from Friday, 17.08.12 worked well
6 colonies are picked in order to perform a Colony PCR and for inoculation of 5 mL DYT-media-CAM
- colony A 4.1/2.1 ligated at 4°C
- colony B 4.1/2.1 ligated at 37°C
- colony C 1.1/5.1 ligated at 4°C
- colony D 1.1/5.1 ligated at 37°c
- colony E 4.2/2.2 ligated at 4°C
- colony F 4.2/2.2 ligated at 37°C
Colony PCR

T_A = 55°C, t_A = 25 s, t_E = 5 min

primers: VF2 & VR

Agarose gel electrophoresis
- did not work due to immense gene legth ( around 4 kb)
Restriction digest for testing is planned
- inoculation of 5 mL DYT-media-CAM with colony E,F,C,D

Wednesday, 22.08.12

Miniprep of inoculated 5 mL DYT-media-CAM with colony E,F,C,D
- c(colony C 1.1/5.1 ligated at 4°C)=46 ng/µL
- c(colony D 1.1/5.1 ligated at 37°c)=46 ng/µL
- c(colony E 4.2/2.2 ligated at 4°C)=60 ng/µL
- c(colony F 4.2/2.2 ligated at 37°C)=58 ng/µL
DNA Digestion of 15 µL of preped plasmids with EcoRI-HF & PstI-HF
- expected insert length: 4.4 kb (BBa_K808000+BBa_K808030)
Agarose gel electrophoresis with 0.8% agarose

Verdau vom Gesamtkonstrukt 4.2_2.2 und 5.1_1.1 beide temperaturen.tif

all bands are in same heights, so ligation worked well
ligation worked well, bands are in estimated length
due to rather bad results of Miniprep colonies are used for inoculation of 5 mL DYT-media-CAM again
- incubation over night at 37°C
evaluation of sequencing from Wednesday, 08.08.12
- PhoA did not work
- EstA is sequenced inconsistent
- pNB-Est13 still got its illegal PstI-site
- but at leat FsC is sequenced completely
new sequencing of
- PhoA in pSB1C3, primers VF2 & VR, 1.5 µL each
- EstA in pSB1C3, primers SOE EstA mut up & BBa EstA down, 1.5 µL each
PCR 1 performed on BBa_K808032(preped colony C 1.1/5.1 ligated at 4°C)
- T_A = 57°C, t_A = 25 s, t_E = 2 min
- primers BBa Est13 up & BBa Est13 down
- performed in 3 batches à 50 µL
analytical Agarose gel electrophoresis 2% agarose
[PCR Clean up]]
DNA Digestion of PCR product with EcoRI-HF & PstI-HF over night at 37°C

Thursday, 23.09.12

Miniprep of colonies from
- c(colony C 1.1/5.1 ligated at 4°C)=147 ng/µL
- c(colony D 1.1/5.1 ligated at 37°c)=131ng/µL
- c(colony E 4.2/2.2 ligated at 4°C)=85 ng/µL
- c(colony F 4.2/2.2 ligated at 37°C)=128 ng/µL
preparative Agarose gel electrophoresis of digested pNB-Est13 from yesterday
Gel extraction leads to c(pNB-Est13- cut E/P)=25 ng/µL
Ligation of digested pNB-Est13 in digested pSB1C3
- 1:5 ratio is used
Heatshock transformation of DH5alpha with 10 µL of ligation batch
incubation of transformed cells at 37°C over night

Friday, 24.08.12

transformation of ligation from yesterday succeeded, colony picked and inoculation of 5 mL DYT-media-CAM
sequencing of
- BBa_K808032 (colony C 1.1/5.1 ligated at 4°C), primers VF2, XbaI Rbs Phoa up, BBa Ara Promo lo, SE Est13 mut up, SOE Est13 mut lo, BBa EstA down, VR, 1.5 µL each,

Week 7 / CW 35

Monday, 27.08.12

Miniprep of picked colony from [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808026 BBa_K808026] ([http://partsregistry.org/wiki/index.php?title=Part:BBa_K808026 pNB-Est13] in [http://partsregistry.org/Part:pSB1C3 pSB1C3])
- c([http://partsregistry.org/wiki/index.php?title=Part:BBa_K808026 pNB-Est13] in [http://partsregistry.org/Part:pSB1C3 pSB1C3])=116 ng/µL
sequencing of [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808026 pNB-Est13] in [http://partsregistry.org/Part:pSB1C3 pSB1C3]
- using primers VF2, VR, SOE Est13 mut up, SOE Est13 mut lo
test expression of BBa_K808032 (colony C 1.1/5.1 ligated at 4°C) in DH5alpha
- BBa_K808032 is an arabinose regulated RBS-PhoA-His6tag-pNBEst13-Myctag-EstA
- inoculation of 50 mL DYT-media-CAM with DH5alpha carrying [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808032 BBa_K808032]
  - stop incubation at at OD₆₀₀=0.7
  - storaging cultures on ice for 15mins
  - inducing with ~ 1.5% L-arabinose (using 3.75 mL of 20% mw L-arobinose solution)
  - incubation at 20°C, 25°C and 30°C over night

Tuesday, 28.08.12

antibody staining
detection of surface expression of [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808032 BBa_K808032] by using FACS
positive signal increases with higher temperature, staining succeeded
protein purification of test expression without rinnung IMAC afterwards, just using supernatant and cell debris pellet
- 32 µL of supernatant is used
- 3 mL pellet of each testexpression is treated with more SDS as a detergent, in order to solve membrane proteins
running two SDS-tris gels with an myc positive probe
one of these gels is used for performing a Westernblot
- using mouse-antimyc antibody as first antibody and goat-antimouse-AP as second antibody

120831 Westermblot auf Gesamt konstrukt aus DH5 alpha 5111.tif

both are not very good in their solution, we do it again with Laemmli gels

Wednesday, 29.08.12

evalutation of sequencing from last week:
- PhoA worked
- EstA worked
- pNB-Est13 worked
- RBS-PhoA-His6tag-pNBEst13-Myctag-EstA worked
- arabinose regulated RBS-PhoA-His6tag-pNBEst13-Myctag-EstA

Thursday, 30.08.12

running 2 SDS-Laemmli gels
- pellet is treated with n-Dodecyl-ß-maltoside (DDM) in order to solve membrane proteins

one gel is used to perform a second Western blot with a myc positive probe

File:120831 Westermblot 2 auf Gesamt konstrukt aus DH5 alpha 5111.tif

2 supernatant 30°C, 3 pellet (treated with detergent) 30°C, 4 supernatant 25°C, 5 pellet (treated with detergent) 25°C, 6 supernatant 20°C, 7 pellet (treated with detergent) 20°C, 8 myc positive probe
as we can see, only the treated 120831 Westermblot 2 auf Gesamt konstrukt aus DH5 alpha 5111pellets show positive signals when treated with antibodies, so we have expressed our membrane protein [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808032 BBa_K808032]
now our lab can start with quantification of enzymatic activites of BBa_K808032 on PET or model substrates

Activity tests of [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808032 BBa_K808032]

Week 1 / CW 35

Friday, 31.08.12

Activity assay in DYT with DH5α containing [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808032 BBa_K808032] (arabinose inducable RBS-PhoA-His6tag-pNBEst13-Myctag-EstA)

Component	test tube 1	test tube 2	test tube 3	test tube 4
DYT-medium	8 mL	8 mL	8 mL	8 mL
PET particle	yes	yes	yes	yes
bacteria	yes	yes	yes	no
induced	1.5% L-arabinose	1.5% L-arabinose	no	no

test seemed to have worked: but an induced test tube without PET-granula was missing

Week 2 / CW 36

Tuesday, 04.09.12

Activity assay in DYT with DH5α containing [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808032 BBa_K808032]

Component	test tube 1	test tube 2	test tube 3	test tube 4	test tube 5
DYT-medium	8 mL	8 mL	8 mL	8 mL	8 mL
PET particle	yes	yes	no	yes	yes
bacteria	yes	yes	yes	no	yes
induced	1.5% L-arabinose	1.5% L-arabinose	1.5% L-arabinose	no	no

test tube 3: DYT without bacteria contains CAM, Kan, AMP
looks good but test tube 2 shows no significant change of colour

Wednesday, 05.09.12

Activity assay in DYT with DH5α containing [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808032 BBa_K808032]

Component	tube 1	tube 2	tube 3	tube 4	tube 5	tube 6	tube 7	tube 8	tube 9
DYT-medium	8 mL	8 mL	8 mL	8 mL	8 mL	8 mL	8 mL	8 mL	8 mL
PET particle	yes	yes	yes	yes	no	no	yes	yes	yes
bacteria	yes	yes	yes	yes	yes	yes	yes	yes	no
induced	1.5% L-arabinose	1.5% L-arabinose	1.5% L-arabinose	1.5% L-arabinose	1.5% L-arabinose	1.5% L-arabinose	no	no	no

test tube 9: DYT without bacteria contains CAM, Kan, AMP
all induced tubes turned yellow, even without PET-granula as a substrate
no more avtivity tests, we are awaiting the evaluation of test expression series of the [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808000 arabinose inducible promoter] conjugated to GFP

Trouble shooting

evaluation shows a very high sensisty of [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808000 arabinose inducible promoter [BBa_K808000]] even to low concentrations of L-arabinose (expression starts at around 0.01%)
induction of the DH5α with 1.5% arabinose ended fatal due to extrem expression of the transmembrane construct [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808030 RBS-PhoA-His6tag-pNBEst13-Myctag-EstA]
starting test expressions with lower L-arabinose concentrations ranging from 0.05% - 1%

Thursday, 06.09.12

Activity assay in DYT with DH5α containing [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808032 [BBa_K808032]] (arabinose inducable RBS-PhoA-His6tag-pNBEst13-Myctag-EstA)

Component	tube 1	tube 2	tube 3	tube 4	tube 5	tube 6	tube 7	tube 8	tube 9	tube 10	tube 11
DYT-medium	5 mL	5 mL	5 mL	5 mL	5 mL	5 mL	5 mL	5 mL	5 mL	5 mL	5 mL
PET particle	yes	yes	yes	yes	yes	yes	no	no	no	no	no
bacteria	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	no
induced	1% L-arabinose	1% L-arabinose	0.75% L-arabinose	0.75% L-arabinose	no	no	1% L-arabinose	1% L-arabinose	0.75% L-arabinose	0.75% L-arabinose	no

test tube 11: DYT without bacteria contains CAM, Kan, AMP
all induced tubes turned yellow, even without PET-granula as a substrate

Week 3 / CW 37

Monday, 10.09.12

we stopped the trial of quantification via PET-substrates because in terms of color the change of pH value (due to acid groups that are released by degradtion) is not very exactly. In order to get reproducible data, we are using new activity assays.
next bacterial assays are going to be in 96 well plates using a pNP-Assay
Heatshock transformation of [http://ecoliwiki.net/colipedia/index.php/MG1655 Mg1655] with [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808032 BBa_K808032] and [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808030 BBa_K808030]
activity assay on LB-Tributyrin-CAM-plates with L-arabinose concentrations: 0.1%, 0.2%, 0.4%
- colony 1-5 are [http://ecoliwiki.net/colipedia/index.php/DH5_alpha DH5 alpha] containing [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808032 BBa_K808032] but colony 6 is just DH5 alpha carrying [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808030 BBa_K808030]
- incubated over night at 37°C

Tuesday, 11.09.12

inoculation of 5 mL DYT-media-CAM with K1 and K2 of transformed [http://ecoliwiki.net/colipedia/index.php/MG1655 Mg1655] from yesterday
acticity tests on LB-Tributyrin-CAM-plates shows good results
- from now on incubation at room temperature

Wednesday, 12.09.12

Plasmid preparation of inoculated [http://ecoliwiki.net/colipedia/index.php/MG1655 Mg1655] colonies K1 and K2
DNA digestion with EcoRI-HF & PstI-HF
qualitative AGE

Thursday, 13.09.12

the activity assay on LB-Tributyrin-CAM-plates from tuesday gives good results

to perform a better expression of [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808030 BBa_K808030] we will use [http://ecoliwiki.net/colipedia/index.php/TOP10 Top10] as a host for [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808032 BBa_K808032]. Its unability to metabolize L-arabinose is crucial for our decision. We hope to generate good expression levels.
Electroporation (after washing ecletroporation cuvettes very carefully) of [http://ecoliwiki.net/colipedia/index.php/TOP10 Top10] with [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808032 BBa_K808032]

Friday, 14.09.12

yesterdays electroporation worked well
inoculation of 50 mL DYT-media-CAM with colony from plate of [http://ecoliwiki.net/colipedia/index.php/TOP10 Top10] carrying [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808032 BBa_K808032]

Saturday, 15.09.12

making 10% DMSO stocks from 50 mL [http://ecoliwiki.net/colipedia/index.php/TOP10 Top10] culture

Week 4/ KW 38

Monday, 17.09.12

inoculation of 4 x 50 mL DYT-media-CAM with [http://ecoliwiki.net/colipedia/index.php/TOP10 Top10] stocks
at OD₆₀₀=0,5 the cultures are incduced with:
- 0.02% mw L-arabinose
- 0.2% mw L-arabinose
- 0.5% mw L-arabinose
- one culture is not induced and will serve as a negative control
after 3 hours an antibody staining is performed on our expressed [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808032 BBa_K808032] containing a myc-epitope
checking surface expression levels via [http://en.wikipedia.org/wiki/Flow_cytometry#Labels flow cytometry]
- inducing worked well, we can go on with screening the enzymatic activity

Tuesday, 18.09.12

Electroporation of [http://ecoliwiki.net/colipedia/index.php/TOP10 Top10] with [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808030 BBa_K808030], serving as a negative (directly used after 1h of incubation at 37°C in pure DYT-medium)
activity assay of [http://ecoliwiki.net/colipedia/index.php/TOP10 Top10] containing [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808032 BBa_K808032] on LB Tributyrin agar with L-arabinose concentrations: 0.02%, 0.2%, 0.5%
- colonies 1-3 containing [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808032 BBa_K808032] but colony 4 containing [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808030 BBa_K808030]
Protein purification from induced cultures and negative control
- cell debris pellets are treated with [http://www.sigmaaldrich.com/catalog/product/sigma/d4641?lang=en&region=US n-Dodecyl ß-D-maltoside] as a detergent
SDS PAGE (Laemmli) of pellets and supernatants

2: supernatant 0.5% arabinose, 3: treated pellet 0.5% arabinose, 4: supernatant 0.2% arabinose, 5: treated pellet 0.2% arabinose, 7: supernatant 0.02% arabinose, 8: treated pellet 0.02% arabinose, 9: supernatant no arabinose, 10: treated pellet no arabinose

Westernblot is successful as well
to quantify the hydrolytic activity of our induced bacteria we perform a bacterial pNP-Assay

graph shows absorbtion, ergo hydrolytic activity towards pNPB, of induced bacterial cells with an OD₆₀₀=0.1. Blue: Top10 induced with 0.5% arabinose, Orange: Top10 induced with 0.2% arabinose, Yellow: Top10 induced with 0.02% arabinose, Green: Top10 not induced

graph shows the increasing velocity related to the level of induction

Wednesday, 19.09.12

activity assays on LB Tributyrin agar worked well (incubation occured just for the night at 30°C)

activity assays on LB Tributyrin agar with 0.5% mw L-arabinose for inducing
- colonies 1-4 [http://ecoliwiki.net/colipedia/index.php/DH5_alpha DH5 alpha], 5-8 [http://ecoliwiki.net/colipedia/index.php/TOP10 Top10], 9-12 [http://ecoliwiki.net/colipedia/index.php/MG1655 Mg1655]
- colonies 1,2,5,6,9,10 are carrying [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808032 BBa_K808032]
- colonies 3,4,7,8,11,12 are carrying [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808030 BBa_K808030]

Tuesday, 18.09.12

activity assays on LB Tributyrin agar worked well

Protein Expression

CW 24

Thursday, 14.06.2012

PCR for protein expression of FsC
- each PCR is performed in 5 batches à 50 µL.
- Parameter: T_A = 57°C, t_A = 35 s, t_E = 65 s
PCR on pEST100 vector for expression with pEX vector

gene of interest: FsC for designed part [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808032 BBa_K808032]
primers: pEX FsC His SfiI up and pEX FsC Stop SfiI lo

Friday, 15.06.2012

Agarose gel electrophoresis for quality control

CW 25

Wednesday, 20.06.2012

Agarose gel electrophoresis for preparation
Gel extraction of PCR products
Concentration of produced FsC sequence: 40 ng/µL

Thursday, 21.06.2012

Restriction digest of PCR product from 14.06.
- Enzymes used: SfiI
- NEBuffer: 4
- Digestion time: over night
- Digestion temperature: 50°C

Friday, 22.06.2012

Miniprep of pEX vector
Concentration range: 240-488 ng/µL
Restriction digest of pEX
- Enzymes used: SfiI
- NEBuffer: 4
- Digestion time: 3 days
- Digestion temperature: 50°C

CW 26

Monday, 25.06.2012 =

Agarose gel electrophoresis for quality control
Gel extraction of pEX and digested FsC sequence from 21.06.
Concentrations: pEX: 77 ng/µL, FsC sequence: 18 ng/µL
Ligation of pEX with FsC sequence with the ratio 1:3 and 1:5

Component	1:3	1:5
FsC sequence	1.12 µL	2.2 µL
pEX	0.64 µL	0.64 µL
Ligase buffer	4 µL	4 µL
T4 DNA ligase	1 µL	1 µL
H₂O	33 µL	30 µL

Ligation time: over night

Tuesday, 26.06.2012

Bacterial transformation by Electroporation of TOP10 with the ligation product pEX-FsC from 25.06.

Wednesday, 27.06.2012

Two positive clones on LB CAM plates picked for liquid culture
50 mL DYT CAM cultures at 180 rmp and 37°C, over night

Thursday, 28.06.2012

Miniprep of pEX-Fsc in TOP10
Concentration: 45 ng/µL and 405 ng/µL
Bacterial transformation by Electroporation of BmH7118 with the Miniprep product pEX-FsC

CW 27

Monday, 02.07.2012

Protein expression of FsC at different temperatures (16°C, 25°C, 30°C and 37°C) for the final step of the expression

Tuesday, 03.07.2012

Purification of Periplasmatic Proteins for all expression temperatures

Wednesday, 04.07.2012

Protein purification without cell disrupter
SDS-PAGE (Schägger) analysis of all collected samples

Expression at 16°C	Expression at 25°C

Expression at 30°C	Expression at 37°C

The best results were maintained at an expression temperature of 30°C

Friday, 06.07.2012

Inoculation of 5 ml DYT CAM with BmH7118 containing pEX-FsC
Incubation for 3 days at 20°C

CW 28

Monday, 09.07.2012

Miniprep of pEX-FsC from 06.07.
Concentration: 470 ng/µL
Preparation for sequencing at Eurofins
Barcode 043 pEX-FsC with primer M13 Reverse up
Barcode 044 pEX-FsC with primer ClaI pIII lo
Plasmid DNA: 5µL
Primer: 3µL
H₂O: 7µL

Wednesday, 11.07.2012

Protein expression of FsC according to standard protocol

Thursday, 12.07.2012

Protein purification by standard protocol
SDS-PAGE (Schägger) analysis of samples

CW 29

Monday, 16.07.2012

Protein expression of FsC according to standard protocol

Tuesday, 17.07.2012

Protein purification by standard protocol
SDS-PAGE (Schägger) analysis of samples

CW 31

Monday, 30.07.2012

Protein expression of FsC according to standard protocol

Tuesday, 31.07.2012

Protein purification by standard protocol
SDS-PAGE (Schägger) analysis of samples

Enzyme Activity Assays

To characterise our BioBricks [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808026 BBa_K808026] (pNB-Est13) & [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808025 BBa_K808025] (FsC) a pNP-assays are performed.

CW 37

Est13

a pNP-assayis performed with [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808026 BBa_K808026] (pNB-Est13)

Lineweaver-Burk plot of [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808026 BBa_K808026]

K_m and V_max calculation

To find K_m the growth of the first seven data points were written down in a diagram. The slope of the regression line gave the speed of the hydrolysis for the single substrate concentrations. Now the value of the speed with the associated concentration of substrate were plotted in a Lineweaver-Burk diagram. At the point where the regression line is crossing the x-axis the x-coordinate amounts to -1/K_m. So K_m is about 400µM. To calculate the value of V_max we used the point where the plotted line crosses the y-axis. The associated y-coordinate is 1/V_max. Consequently V_max for 50nM Est13 is 0,002798 1/s.

K_cat calculation

The value K_cat is calculated through dividing V_max by the enzyme concentration of 50nM. K_cat counts 0,055951 1/mol*s.

FsC

a pNP-assayis performed with [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808026 BBa_K808025] (FsC)

Lineweaver-Burk plot of [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808025 BBa_K808025

K_m and V_max calculation

To find K_m the growth of the first twelve data points were written down in another diagram. The slope of the regression line gave the speed of the hydrolysis for the single substrate concentrations. Now the value of the speed with the associated concentration of substrate were plotted in a Lineweaver-Burk diagram. At the point where the regression line is crossing the x-axis the x-coordinate amounts to -1/K_m. So K_m is about 400µM. To calculate the value of V_max we used the point where the plotted line crosses the y-axis. The associated y-coordinate is 1/V_max. Consequently V_max for 5nM FsC is 0,001467 1/s.

K_cat calculation

The K_cat value is calculated through dividing V_max by the enzyme concentration of 5nM. K_cat counts 0,293395 1/mol*s.

FsC with ehtylenglycol

Our Simulation lab was able to show , theoratically, a relation between an decrease of enzyme activity and an increase of ethylenglycol concentration. This could be a hint for the mysterious loss of hydrolysis when the degradation rate reaches 5% of PET foil weight as it is described in the literature (Ronkvist, Å. M., Xie, W., Lu, W., & Gross, R. a. (2009). Cutinase-Catalyzed Hydrolysis of Poly(ethylene terephthalate). Macromolecules, 42(14), 5128–5138. doi:10.1021/ma9005318). We tried to proof their theory of potentially higher ethylenglycol concentration surrounding the PET foil. An increasing amount of ehtylenglycol should hamper the hydrolytic activity of FsC in a pNP-assay.

Procedure

The lab test procedure was nearly equal to the normal kinetics records with only one difference. The reaction solution consisted of different composites of PBS buffer and ethylenglycol (0 - 20%). All records were done at a concentration of 1mM of 4-Nitrophenyl butyrate in the experiment.

Records of the different ethylenglycol concentrations and the associated speeds of hydrolisis in a diagram

of enzyme activity related to an increasing ehtylenglcol concentration

Interpretation

As you can see there is a stagnation of the speed of hydrolysis of the ester caused by an increasing concentration of ethylenglycol. But by that you cannot tell that ethylenglycol inhibits the FsC, because the hydrolysis of the ester rose with a higher concentration of ethylenglycol in the negative samples. So it could be that the ethylenglycol starts a concurrent reaction or blocks the 4-Nitrophenyl butyrate.

Plot of "activty" in the negative sample: pNPB & ethylenglycol

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 [[File:120426_PCR_4-6_siehe_Laborbuch_26.4.tif]]
 * 2-5 4.PCR, 6-9 5.PCR, 710-13. 6.PCR

Team:TU Darmstadt/Labjournal/Degradation

From 2012.igem.org

Revision as of 04:56, 26 September 2012

Contents

SOE PCR

Week 1 / CW 17

Tuesday, 24.04.12

Wednesday, 25.04.12

Thursday, 26.04.12

Friday, 27.04.12

Week 2 / CW 18

Monday, 30.04.12

Wednesday, 02.05.12

Tuesday, 03.05.12

Friday, 04.05.12

Week 3 / CW 19

Tuesday 08.05.12

Wednesday, 09.05.12

Friday, 09.05.12

Week 4 / CW 20

Monday, 14.05.12

Tuesday, 15.05.12

Wednesday, 16.05.12

Week 5 / Kw 21

Monday, 23.05.12

Tuesday, 22.05.12

Wednesday, 23.05.12

Thursday, 24.05.12

Week 6 / Kw 22

Tuesday, 29.05.12

Thursday, 29.05.12

SKV

Week 1 / CW 17

Tuesday, 24.04.12

Wednesday, 25.04.12

Thursday, 26.04.12

Friday, 27.04.12

Week 2 / CW 18

Monday, 30.04.12

Week 4/CW 20

Monday, 07.05.

Tuesday, 08.05.

Wednesday, 09.05.

Thursday, 10.05.

Friday, 11.05.

Week5/CW21

Monday, 14.05.

Tuesday, 15.05.

Wednesday, 16.05.

Friday, 18.05.

Week 6/CW 22

Monday, 21.05.

Tuesday, 22.05.

Wednesday, 23.05.

Wednesday, 23.05.

Thursday, 24.05.

Friday, 25.05.

week 7/CW 23

Tuesday, 29.05.

Wednesday, 30.05.

Thursday, 31.05.

Friday, 01.06.

week 8/CW 24

Monday, 04.06.

Tuesday, 05.06.

Wednesday, 06.06.

Friday, 08.06.

week8/ CW24

Monday, 11.06.

Tuesday, 12.06.

Wednesday, 13.06.

Friday, 15.06.

week9/CW25

Monday, 18.06.

Tuesday, 19.06.

Wednesday, 20.06.

Friday, 22.06.

BioBricks

Week 1 / Kw 29

Tuesday, 17.07.12