Difference between revisions of "Part:BBa K581006"

Revision as of 18:32, 5 October 2011

Pc+ptsG(wt)-GFP (ptsG(wt) 5' UTR fused with gfp)

PtsG is a glucose permease which is subordinate to phosphotransferase system serve as a transpotor. Here,we studied this mRNA perform the conjugate part of the small RNA regulator sgrS(wt)[1]. ptsG mRNA is regulated by SgrS by short, imperfect base-pairing interactions, and its expression is thus repressed.

                
       Fig.1 Sequence alignment of wildtype ptsG/SgrS pair and its mutant complementary pairs.

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.

Sequence and Features