Difference between revisions of "Part:BBa K887004"

Revision as of 12:18, 2 October 2012

Plac+alsS+ilvC+ilvD(each preceded by own zinc-finger and RBS)+Ptet+B0032+kivD+B0015

The main goal of our project this year is to improve the production of isobutanol in E.coli. In addition to the temperature control system, we also find the zinc fingers to be a perfect solution for our project. According to 2010 Slovenia team, the yield of violacein was at least 2-fold higher with the application of the zinc finger. Therefore, We expect higher concentration of isobutanol.

This part（BBa_87004) ,which is ligated from Biobrick(Part:BBa_K887000) with another one(Part:BBa_K539741)contain four enzymes. Each of the former three enzymes(alsS, ilvC& ilvD) linked with a zinc finger. The three enzymes could convert pyruvate into 2-ketoisoalerate(the Intermediate of isobutanol). The final enzyme(kivD)could change 2-ketoisoalerate into isobutyraldehyde, which would be converted into isobutanol by ADH in E.coli. This is a complete circuit to produce isobutanol.(Reference: Atsumi, S.; T. Hanai and J.C. Liao (2008) Non-Fermentative Pathways for Synthesis of Branched-Chain Higher Alcohols as Biofuels, Nature, 451:86-89.)

We also encoded three zinc fingers zif268(Part:BBa_K323105), PBS II(Part:BBa_K323107) and HIVC(Part:BBa_K165006)in our host (DH5a). Our current isobutanol yield by using temperature control system is about 0.7%, thus our conservative estimate of the isobutanol production is about 1.4%v/v(11.2g/L) which is better than recent paper(2011 Metabolic Engineering 13, James C. Liao) ,8.0g/L .

Furthermore, We modified DNA program(Part:BBa_K887011)from 2010 Slovenia(Part:BBa_K323066)because of one base lost. We use DNA program to make a scaffold, which the enzymes fused with the Zinc finger can bind on.

Sequence and Features