Difference between revisions of "Part:BBa K887000"

Revision as of 15:51, 26 September 2012

Plac+B0034+zif268+alsS+B0034+PBSII+ilvC+B0034+HIVC+ilvD+37℃ induced RBS+tetR+double terminator

In traditional genetic engineering method, we use strong promoter to initiate our gene expression, so that E.coli will overexpress the proteins we need in synthetic pathway. However, this overexpression of target proteins will cause E.coli wastes its limited growth resources, so the activity and performance of the enzymes may be too low. In this situation, the synthetic pathway is unbalanced, and the production of isobutanol will not be optimum. This is also a problem in the production of isobutanol which is poisonous to E.coli.
We make a big change to improve the traditional gene.
To solve the problem, we need to adjust the expression of the genes. We use the cellulose to produce glucose. Glucose can be catalyzed into isobutanol through afterward enzymes- Alss, Ilvc, Ilvd,and Kivd step by step.But isobutanol and isobutyraldehyde have biological toxicity and also can denature proteins,so we design a temperature control system to stop at the step that produce 2-Ketoisovalerate. We accumulate lots of the non-toxic intermediate as the precursor, 2-Ketoisovalerate, to a certain amount, and then convert the entire non-toxic precursor into the product, isobutanol, all at once. The toxic isobutanol and isobutyraldehyde will produce at the last minute and cause less harm.

But we are not satisfied.

Sequence and Features