Team:TU Darmstadt/Labjournal/Transport

Transport

Week 1 (21.-25.05.12)

• First colony PCR of Comamonas testosteroni for isolation of the following genes: [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808004 tctA 505aa] (1), [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808005 tctB 197aa] (2), [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808002 tctA_503aa] (3), [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808003 tctB 162aa] (4), [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808001 tphC 322aa] (5). Analysis of [http://en.wikipedia.org/wiki/Polymerase_chain_reaction PCR] products by agarose gel electrohporesis

• PCR product purification using the Promega-Kit
• Nanodrop measurements of the purified PCR products:

(1) : 19.5 ng/µl 260/280=1.58

(2) : 61.9 ng/µl 260/280=1.75

(3) : 75.1 ng/µl 260/280=1.75

(4) : 93.3 ng/µl 260/280=1.85

(5) : 91.3 ng/µl 260/280=1.58

• Restriction digest of PCR products by SpeI and EcoRI, heat inactivation after digestion
• Analysis of restriction digest by agarose gel electrohporesis

• Purification of the bands gained form gel electrophoresis (Promega-Kit)
• Nanodrop measurements of the purified products:

(1) : 8.3 ng/µl 260/280=1.94

(2) : 8.9 ng/µl 260/280=1.80

(3) : 13.0 ng/µl 260/280=1.57

(4) : 1.5 ng/µl 260/280=3.08

(5) : 3.7 ng/µl 260/280=2.26

week 2 (28.05.-01.06.12)

• Purified products from 1. week were ligated into pSB1A2 and subsequently transformed into DH5α (in spite of low concentration)
• Overnight incubation on LB agar plates; no growth detectable
• Second approach to isolate the five genes from Comamonas t. using colony-PCR
• Analysis of PCR products by agarose gel electrohporesis; without results; modification of the PCR protocols: adding DMSO
• Third approach to isolate the five genes from Comamonas t. by colony-PCR
• PCR product purification using the Promega-Kit: ([http://partsregistry.org/wiki/index.php?title=Part:BBa_K808005 tctB 197aa] (2), [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808002 tctA_503aa] (3), [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808003 tctB 162aa] (4), [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808001 tphC 322aa] (5))

(1): no PCR-product

• Nanodrop measurements of the purified PCR products:

(2) : 56.1 ng/µl 260/280=1.87

(3) : 66.8 ng/µl 260/280=1.92

(4) : 72.8 ng/µl 260/280=1.87

(5) : 68.8 ng/µl 260/280=1.82

week 3 (04.-08.06.12)

• Restriction digest of the purified PCR products and of [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808004 tctA 505aa] (leftover of the 1. week) by SpeI and EcoRI
• Restriction restriction digest of pSB1A2 using SpeI and EcoRI
• Dephosphorylation of the restriction reactions by using antarctic Phosphatase
• Ligation of the five genes into pSB1A2 and subsequently transformation into DH5α (incubation at 37°C)
• colony-PCR of [http://partsregistry.org/wiki/index.php?title=Part:BBa_K808004 tctA 505aa] (1), 2 approaches
• Analysis of PCR products by agarose gel electrohporesis. Only one of them showed the expected band. The band was excluded and purified via the Promega-Kit.

• Nanodrop measurement of the purified product:

(1.1) =8.9 ng/µl 260/280=2,22

Because of low concentration and contamination the PCR was repeated and the product was purified again by the Promega-Kit.

• Performing a colony-PCR-screen of the transformed cells using the Taq-Polymerase. Verification of 4 colonies per plate.

PCR did not work

• Testing the Taq-Polymerase for function. The Phu-Polymerase was used for comparison. Only the approach using the Phu-Polymerase showed the expected bands in agarose gel electrohporesis.