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. 1989 May;171(5):2708–2718. doi: 10.1128/jb.171.5.2708-2718.1989

Promoter specificity of sigma G-containing RNA polymerase from sporulating cells of Bacillus subtilis: identification of a group of forespore-specific promoters.

W L Nicholson 1, D X Sun 1, B Setlow 1, P Setlow 1
PMCID: PMC209955  PMID: 2468649

Abstract

During sporulation in Bacillus subtilis, expression of the genes sspA, sspB, sspC, sspD, and sspE, which encode a family of small, acid-soluble spore proteins, as well as of the spoVA and gdh operons is transcriptionally activated at stage III of sporulation only in the forespore compartment. Transcription of these genes is mediated by RNA polymerase containing sigma G (E sigma G), the product of the sigG gene, which is itself expressed at stage III in the developing forespore. We have determined the 5' ends of transcripts generated both in vivo and in vitro by the action of E sigma G on various genes of B. subtilis and other bacilli. The 5' ends of the in vivo and in vitro mRNAs were found to coincide and were therefore considered to define the transcription initiation sites for the genes examined. We identified highly homologous DNA sequences centered at 35 and 10 base pairs preceding the transcriptional start sites of the genes examined. Consequently, we propose that these sequences define a class of promoters recognized only by E sigma G which allow transcription of genes expressed uniquely at stage III in the developing forespore.

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