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A dedicated translation factor controls the synthesis of the global regulator Fis

By Róisín M. Owens, Gareth Pritchard, Paul Skipp, Michelle Hodey, Sean R. Connell, Knud H. Nierhaus and C. David Connor


BipA is a highly conserved protein with global regulatory properties in Escherichia coli. We show here that it functions as a translation factor that is required specifically for the expression of the transcriptional modulator Fis. BipA binds to ribosomes at a site that coincides with that of elongation factor G and has a GTPase activity that is sensitive to high GDP:GTP ratios and stimulated by 70S ribosomes programmed with mRNA and aminoacylated tRNAs. The growth rate-dependent induction of BipA allows the efficient expression of Fis, thereby modulating a range of downstream processes, including DNA metabolism and type III secretion. We propose a model in which BipA destabilizes unusually strong interactions between the 50 untranslated region of fis mRNA and the ribosome. Since BipA spans phylogenetic domains, transcript-selective translational control for the ‘fast-track’ expression of specific mRNAs may have wider significance

Topics: QH301
Year: 2004
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Provided by: e-Prints Soton
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