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J. Bacteriol., 05 1995, 2663-2672, Vol 177, No. 10
Copyright © 1995, American Society for Microbiology

The product of the pleiotropic Escherichia coli gene csrA modulates glycogen biosynthesis via effects on mRNA stability

MY Liu, H Yang and T Romeo
Department of Microbiology and Immunology, University of North Texas Health Science Center at Fort Worth 76107-2699, USA.

The carbon storage regulator gene, csrA, modulates the expression of genes in the glycogen biosynthesis and gluconeogenesis pathways in Escherichia coli and has been cloned, mapped and sequenced (T. Romeo, M. Gong, M.Y. Liu, and A.M. Brun-Zinkernagel, J. Bacteriol. 175:4744- 4755, 1993; T. Romeo and M. Gong, J. Bacteriol. 175:5740-5741, 1993). We have now conducted experiments that begin to elucidate a unique mechanism for csrA-mediated regulation. Steady-state levels of glgC transcripts, encoding ADP-glucose pyrophosphorylase, were elevated by up to sixfold in a csrA::kanR mutant and were less than 6.5% of wild- type levels in a strain containing pCSR10 (csrA+), as shown by S1 nuclease protection analysis. The rate of chemical decay of these transcripts after adding rifampin to cultures was dramatically reduced by the csrA::kanR mutation. Deletion studies of a glgC'-'lacZ translational fusion demonstrated that the region surrounding the initiation codon was important for csrA-mediated regulation and indicated that neither csrA-mediated regulation nor stationary phase induction of glgC expression originates at the level of transcript initiation. Cell-free (S-200) extracts containing the CsrA gene product potently and specifically inhibited the in vitro transcription- translation of glg genes. The deduced amino acid sequence of CsrA was found to contain the KH motif, which characterizes a subset of diverse RNA-binding proteins. The results indicate that CsrA accelerates net 5'- to-3' degradation of glg transcripts, potentially through selective RNA binding.


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