From 2014.igem.org

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PCR's for gene isolation

Gel 1.High Fidelity PCRs Electrophoresis Gel . Well content: 2) NeoR PCR(786pb) 3)CMV Promoter PCR(588bp) 4) BGHPA PCR (228bp).

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Biobricks in plasmid psB1C3

BGHPA

The ligation (view Material and Methods) of BGHPA was made with J04450 (psB1C3 with RFP protein). The BB_J04450 by itself produces red colonies and grows in the antibiotic Cloramphenicol. After the ligation and transformation, only the white colonies were selected. An extraction from a white colony growing on 50ml LB Cam+ was made in order to perform gel electrophoresis as shown in figure B.

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Figure A. Isolated BGHPA transformed colony.

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Figure B. BGHPA in plasmid psB1C3 gel electrophoresis. Lane 2.

CMV

The ligation (view material and methods) of CMV was made with J04450 (psB1C3 with RFP protein). The BB_J04450 by itself produces red colonies and grows in the antibiotic Cloramphenicol. After the ligation and transformation, only the white colonies were selected. An extraction from a white colony growing on 50ml LB Cam+ was made in order to perform gel electrophoresis as shown in figure B.

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Figure A. Isolated CMV transformed colony.

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Figure B. CMV in plasmid psB1C3 gel electrophoresis. Lanes 1-3.

NeoR

The ligation (view material and methods) of NeoR was made with J04450 (psB1C3 with RFP protein). The BB_J04450 by itself produces red colonies and grows in the antibiotic Cloramphenicol. After the ligation and transformation 8 (Figure A), only the white colonies were selected. An extraction from a white colony growing on 50ml LB Cam+ was made in order to perform gel electrophoresis as shown in Figure B. On lane 8, NeoR extraction is shown with the three bands isoforms, they are barely visible because the plasmid extraction was diluted 5 fold.

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Figure A. Isolated NeoR transformed colony.

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Figure B. NeoR in plasmid psB1C3 gel electrophoresis.
Lanes:
2-4. NeoR in psB1C3 digestion with XhoI.
6-8. NeoR in psB1C3.
10-12. CMV in psB1C3.

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Experiment Two

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Experiment Three

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Recombinant Protein Expression

The samples were loaded in a 15% acrylamide gel, using Precision Plus Protein TM Dual Color Standards, for 20 minutes/90 V for the stacking gel and 60 minutes/150V for the resolving gel. The results are now presented:

Only the samples shown in the image before were the ones that presented notable bands that represent our protein of interest. As expected, the most remarked band is the one of the time 3, which means that inductions was taken correctly and more protein was produced, in other words, the protein was overexpressing. The band marked with the arrow represents a protein that weights approximately 34 kDa, which corresponds to the molecular weight of oxoacyl reductase according to ExPASy’s Compute pI/MW tool.

7-dehydratase was analyzed by SDS-PAGE in a 15% acrylamide gel using Precision Plus Protein TM Unstained Standards, for 20 minutes/90 V for the stacking gel and 90 minutes/110V for the resolving gel. Four samples were taken, including one before and after induction with IPTG, one from the soluble phase and one from the inclusion bodies; all prepared with Laemmli buffer. The results are shown in the image below.

No analysis of solubility was realized due to the quantity of protein. It was supposed to be done exactly the same than oxoacyl reductase, as the protein was found in a notable way in the inclusion bodies as shown in the lane 5.

For both enzymes no further work was done. After the identification of each of them, and after the analysis of solubility, the proteins have to be purified by affinity chromatography with a Invitrogen Ni-NTA Agarose column, taking the advantage of the histidine tag added to the protein. After the purification, enzymatic parameters would be determined by the interaction of the enzymes with the substrate; 7β-Hydroxycholesterol for cholesterol oxidase, and 5-Cholesten-3β-ol-7-one for 7-dehydratase and oxoacyl reductase.

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