Difference between revisions of "Part:BBa K581004"

Revision as of 23:05, 5 October 2011

ptsG2-GFP (ptsG2 5'UTR fused with gfp)

PtsG2 is the C87G mutant of ptsG(wt) and the conjugate part of SgrS2 in our comparator device.

PtsG is a glucose permease which is subordinate to phosphotransferase system and serves as a transporter. 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.

Furthermore, as a proof-of-concept experiment, we constructed synthetic gene circuits, in which the 5’ untranslated region of ptsG mRNA was translationally fused to the coding sequence of the reporter gfp. The fluorescence intensity of GFP could reflect the repression effect that SgrS exerts on ptsG.

<h>Experimental Data</h>

Sequence and Features