Difference between revisions of "Part:BBa K581004"

Revision as of 22:15, 5 October 2011

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

Sequence and Features

Assembly Compatibility:

10
COMPATIBLE WITH RFC[10]
12
COMPATIBLE WITH RFC[12]
21
COMPATIBLE WITH RFC[21]
23
COMPATIBLE WITH RFC[23]
25
COMPATIBLE WITH RFC[25]
1000
INCOMPATIBLE WITH RFC[1000]
Illegal BsaI.rc site found at 747

This BioBrick has been sequence verified.

Background

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)'''[https://parts.igem.org/wiki/index.php?title=Part:BBa_K581005]. ptsG mRNA is regulated by SgrS by short, imperfect base-pairing interactions, and its expression is thus repressed. [[Image:Mechanism.png]] ''' 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.

Experimental Data

Methods

References

[1] Geissmann, T.A., and Touati, D. (2004). Hfq, a new chaperoning role: binding to messenger RNA determines access for small RNA regulator. The EMBO journal 23: 396-405

[2] Kawamoto, H., Koide, Y., Morita, T., and Aiba, H. (2006). Base-pairing requirement for RNA silencing by a bacterial small RNA and acceleration of duplex formation by Hfq. Molecular microbiology 61: 1013-1022

[3] Levine, E., Zhang, Z., Kuhlman, T., and Hwa, T. (2007). Quantitative characteristics of gene regulation by small RNA. PLoS biology 5: e229

@@ Line 21: / Line 21: @@
 <h2>Background</h2>
-<p>ptsG2 is the C87G mutant of ptsG(wt) and the conjugate part of SgrS2 in our comparator device (see Fig. 1).
+<p>ptsG2 is the C87G mutant of ptsG(wt) and the conjugate part of SgrS2 in our comparator device.
-[[File:M_P2_S2.png‎|680px]]
+'''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)'''[https://parts.igem.org/wiki/index.php?title=Part:BBa_K581005].
+ptsG mRNA is regulated by SgrS by short, imperfect base-pairing interactions, and its expression is thus repressed.
+                   [[Image:Mechanism.png]]
+                 ''' Fig.1''' Sequence alignment of wildtype ptsG/SgrS pair and its mutant complementary pairs.
-''Fig. 1  The complementary pair of ptsG2 mRNA and corresponding SgrS2.''
+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.