Difference between revisions of "Part:BBa K581000"

Revision as of 17:20, 5 October 2011

sgrS1+Terminator (small RNA regulator, conjugate part of ptsG1)

This part acts as a small regulatory RNA conjugate part of ptsG1 in our comparator device.

SgrS(sugar transport-related sRNA)(wt) is a small RNA regulator that help cells recover from glucose-phosphate stress by base pairing with ptsG(wt) mRNA. SgrS regulates ptsG mRNA by short, imperfect base-pairing interactions; as a result, the expression of PtsG is repressed.

Teppei Morita et.al’ s work suggests that two mutations (C85G and C87G) in ptsG mRNA could completely impair the ability of SgrS to downregulate its expression, while compensatory mutations of SgrS (G178C and G176C) restore the gene silencing ability. These results indicate that it is the base pairing of the two RNAs rather than particular nucleotides that is important for SgrS action. They have also illustrated that sequence outside this region, even though complementary, is rather dispensable for the efficient silencing (Kawamoto et al., 2006). This makes mutant ptsG/SgrS pairs orthogonal to genetic context of the host cell. Therefore we choose this couple of conjugate mRNA/sRNA as the foundation of our comparator device design.

In our designing， two sets of mutant ptsG mRNA as well as its complementary SgrS were simply by ways of ptsG(wt)/SgrS(wt) modification , we developed an architecture that could respond to different signal chemical wires respectively, that is the ptsG1/SgrS1 and ptsG2/SgrS2 system set to biologically implement the comparator. In detail, ptsG1 refers to a C85G mutant of ptsG (wt)while SgrS1 (G178C) the corresponding revertants which could help restore their complementarity.

Sequence and Features