Coding

Part:BBa_K2207023:Experience

Designed by: Zifan Xie   Group: iGEM17_ZJU-China   (2017-10-21)


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The gene which can express serine protease in yeast was synthesized by Genscript. Before synthesizing this gene, we did codon optimization based on the codon preference of yeast and added a flag-tag to the N-terminal of the serine protease.After extracting the whole proteins of the yeast which transferred plasmid successfully, we performed western-blot and checked the serine protein was expressed in the yeast. (Result is as follow) The band was very shallow, in other words, the concentration of the serine protease was very low.

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Fig1· Western-blot result

The band with red circle was the band of the serine protease and the marker was a protein marker of aidlab.

In order to test whether the serine protease could work normally in the yeast, we performed the enzyme activity detection using BAEE solution. We did two sets of experiments: one added PMSF, which was a inhibitor of serine protease, and the other did not. And then, reading the OD253 of these two solutions.(You can know more details about the detection from the protocol) Obviously, the OD253 of the former one is higher than the later one and the values of OD253 increased with time in a period of time ; therefore, we made the conclusion that the yeast produced the serine protase successfully and effectively.

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Fig2· The values of OD253 increased with time

The values of OD253 increased with time and this solution did not add the PMSF.

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Fig3·A box-plot of the OD253

These were the OD253 of the solutions after a period of reaction.The red one was the solution that did not add the PMSF; the blue one was the solution that added. Obviously, the OD253 of the former one is higher than the later one, so that, we could say that the yeast produced the serine protase successfully and effectively.