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Two RNA polymerase sigma factors from Bacillus subtilis discriminate between overlapping promoters for a developmentally regulated gene

Abstract

A developmentally regulated gene (spoVG) from the spore-forming bacterium Bacillus subtilis is expressed from two overlapping promoters, which direct transcription initiating from sites separated by 10 base pairs. Utilization of the upstream promoter is determined by an RNA polymerase sigma factor of molecular weight 37,000 (σ37). We report the isolation of a 32,000-molecular weight species of sigma factor (σ32), which exclusively dictates transcription initiation from the downstream promoter, and suggest a model for the way in which sigma-specific recognition sequences are intermeshed within the spoVG transcription initiation region.

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