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Pubmed ID :21037003
Publication Date : //

A small protein required for the switch from {sigma}F to {sigma}G during sporulation in Bacillus subtilis.


A cascade of alternative sigma factors governs the program of developmental gene expression during sporulation in Bacillus subtilis. Little is known, however, about how the early-acting sigma factors are inactivated and replaced by the later-acting factors. Here we identify a small protein, Fin (formerly known as YabK), that is required for efficient switching from σ(F)- to σ(G)-directed gene expression in the forespore compartment of the developing sporangium. The fin gene, which is conserved among Bacillus species and species of related genera, is transcribed in the forespore under the control of both σ(F) and σ(G). Cells mutant for fin are unable to fully deactivate σ(F) and, conversely, are unable to fully activate σ(G). Consistent with their deficiency in σ(G)-directed gene expression, fin cells are arrested in large numbers following the engulfment stage of sporulation, ultimately forming 50-fold fewer heat-resistant spores than the wild type. Based in part on the similarity of Fin to the anti-σ(G) factor CsfB (also called Gin), we speculate that Fin is an anti-σ(F) factor which, by disabling σ(F), promotes the switch to late developmental gene expression in the forespore.

Authors : Camp Amy H , Wang Anna F , Losick Richard ,

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