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. 1989 Nov;171(11):5933–5939. doi: 10.1128/jb.171.11.5933-5939.1989

Role of sigma H in expression of the fumarase gene (citG) in vegetative cells of Bacillus subtilis 168.

V A Price 1, I M Feavers 1, A Moir 1
PMCID: PMC210457  PMID: 2509423

Abstract

The fumarase gene (citG) of Bacillus subtilis is transcribed from two promoter regions, citGp1 and citGp2 (P1 and P2); the P2 promoter is used by the E sigma H form of RNA polymerase. In order to study the role of P1 and P2 in citG expression, the promoter region and various deletion derivatives that effectively separate P1 and P2 were fused to the Escherichia coli beta-galactosidase gene (lacZ) and introduced into the chromosome in single copy at the amyE locus. P1 functioned to provide a relatively low and stable basal level of fumarase activity throughout growth. In contrast, P2 activity was found to vary over at least a 50-fold range and was responsible for regulating fumarase activity during growth and sporulation in a rich medium and in response to changes in carbon source. To further investigate the role of sigma H in fumarase regulation, citGp2-lacZ fusions were introduced into a strain in which the expression of the chromosomal spoOH gene was under the control of the isopropylthiogalactopyranoside-inducible spac promoter. Induction of pspac did not lead to P2 induction, suggesting that citG expression is not regulated at the level of spoOH transcription.

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Selected References

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