Team:Cornell/testing/project/wetlab/2

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DNA Assembly
DNA Assembly
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<a href="https://2012.igem.org/Team:Cornell/testing/project/wetlab/1">Overview</a>
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<a href="https://2012.igem.org/Team:Cornell/testing/project/wetlab/2">Chassis</a>
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<h3>CymA</h3>
<h3>CymA</h3>
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Revision as of 07:09, 3 October 2012

Chassis

Intro to electroactivity/Shewanella/Mtr pathway

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CymA

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MtrA, MtrB

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MtrC and OmcA

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Role of mtrB

A small plasmid with few expressed genes may not affect the current output of S. oneidensis to a significant degree, but a large plasmid with many expressed genes (such as our secondary naphthalene degradation plasmid) significantly impairs the growth and metabolism of S. oneidensis. Integrating the naphthalene degradation operon into the chromosome of S. oneidensis may help partially alleviate the energy cost of replicating several copies of a huge plasmid. In addition to alleviating the stress caused by expressing a giant operon, integrating our genetic parts into the chromosome eliminates the need to design a selective pressure for S. oneidensis to maintain extrachromosomal DNA.

References

Proteins can be tagged for degradation by proteases with a proteolysis tag. By fusing such a tag to MtrB, we can tell the cell to degrade the protein at a higher rate, allowing us to decrease the steady state concentration of MtrB at all levels of analyte. If we are able to tune the degradation of MtrB such that its concentration at uninduced levels is not sufficient to complex with available MtrA and MtrC, the basal current production that our engineered strains produce would be decreased. Consequently, the dynamic range of our biosensor would be increased, since higher levels of analyte would be needed to generate the promoter activity requisite to produce MtrB in sufficient quantity to fully localize all MtrA and MtrC—i.e., current production would saturate at higher levels of analyte.

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