From 2012.igem.org

Revision as of 08:41, 25 September 2012

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  • 1. Introduction
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  • 4. Outside Modification
  • 5. Inside Modification
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Last year's project: Synchronized Oscillatory System

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week 19: 3 September - 9 September

Mark's hair

Mark will get married soon, so he had to spend the entire monday having his hair done. When he finally returned on tuesday, there was no difference.

Polero

Mr "success" Marnix left with polero coat protein at the downstream of IPTG induced promoter in the chloramphenical backbone in DH5 alpha strain. Han and Wouter took over this part experiment and continued. DH5 alpha strain was minipreped and the plasmids were transformed into JM-109, a E.coli strain used for protein expression. Colony PCR confirmed the transformation was successful witho both sequencing primers and polero primers.

TuYV

TuYV constructs were ligated into pJET blunt vector and transformed into Mach I strain. Later we got many colonies on the plate.

Two colonies PCR with pJET sequencing primers were done to identify 4 different constructs.

We got enough colony containing the coat protein and coat protein with his-tag, but only got one colony containing either coat protein with readthrough or coat protein with readthrough and his-tag.

Hepatitis B general

4 September

• Digestion of HepatitisB with a his tag (PCR fragment)once with Xba1 and Pst1 and once additionally with DPN1 to cut the template DNA from the PCR reaction and avoid transformation with this template construct

• Ligation of the digested fragments into both Bba_J04500 as well as Bba_J04550

5 September

• Transformation with Mach1

7 September

• colony PCR of the transformations from 4. September

-> nothing on the gel – also no positive control!

Hepatitis B ouside modification

• 7 September (Kees)

• 5’phosphorylated primers

By amplifying the whole plasmid, including the whole desired insert, only one pcr step is needed which can be used right away to transform bacteria.

The Primers: FW-TEV: P-AAGATAGCGGCGTTGAAGGAGGAAAATCTTTATTTTCAAGGTCTTGCTGCTGCTGtcgacgctggtggaggt

Reverse-TEV: P-TTCTTTTAGTGCTGCGATTTTCTCCTTCAACGCCGCTATCTTAGCAGCAGCAAGCAGATTATTGCCGACCCAG

Legend:

• Blue: HepBcAg gene
• Arrows: primers
• Black: Backbone
• Red Star: 5’phosphorylation on primers and DNA

Figure 1: Schematic overview of the quick change method used

The primers used for whole plasmid pcr arrived and were diluted to 100µM. The PCR mixture: component Volume (µL) Primers (FW and rev) 2 Enzyme (Phusion Thermo) 0.5 DMSO 100% 1 Buffer (HF Thermo) 10 Template (20ng/µL) 1 MQ water 34 dNTPs 1

PCR protocol: 1: 98˚C; 2min 2: 98˚C; 30s 3: 63˚C; 30s 4: 72˚C; 30s 15× from step 2 5: 4˚C; ∞ After the PCR, 10µL was used to digest with DpnI, 10µL was mixed with T4 ligase and the rest left untreated. DpnI was heat inactivated after which all three different samples (Ligase, DpnI, normal) were used to transform DH5α.

• 8 September (Kees)

• Colonies

All plates contained colonies, however there was only one on the DpnI-digested plate, which would suggested incomplete digestion rather than a wanted colony. Therefore, more of the sample was plated in order to obtain more colonies.

• 9 September (Kees)

• Checked the plates

There were no new colonies at all on the two new plates.

Hepatitis B inside modification

4 September

• Digestion of the step 4 PCR fragment once with Xba1 and Pst1 and once additionally with DPN1 to cut the template DNA from the PCR reaction and avoid transformation with this template construct

• Ligation of the digested fragments into both Bba_J04500 as well as Bba_J04450

5 September

• Transformation with Mach1

7 September

• colony PCR of the transformations from 4. September

-> nothing on the gel – also no positive control!

GFP modification

3rd September

• 2nd PCR check of the minipreps from 31th Aug (this time only the ones with a high DNA concentration) with sequencing primers as well as with GFP primers (from GFP-coil fusion step1)

-> still no bands on the gel

4th September

To ligate the PCR product of step II into a pSB1C3/ pSB1AK3 it was necessary to digest the IPTG backbone and the RFP backbone first. Digested PCR product was already available. PCR purification after digestion

ligation 4 samples: • R1 – Bba_J04450 + GFP I • R2 – Bba_J04450 + GFP II • I1 – Bba_J04500 + GFP I • I1 – Bba_J04500 + GFP I

The ligation mixtures were incubated for 30 min at 22°C and 10 min heat inactivation of the ligase at 65°C. Followed by a transformation of E.coli strains MachI/ DH5α with the ligated plasmids and a 2h growth in SOC-medium. Transformed cell were later plated on agar plates with the corresponding antibiotic. Unfortunately we found no colonies on the after 24 h respectively 48 h of growth at 37°C.

6th September

• Ligation of the 1st step of the PCR reaction into pJET

• transformation with Mach1

-> very slow growth, only a few colonies of which some where green (probably the template Bba_I13522 (untagged GFP behind a constitutive promoter))

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