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. 1990 Jun;172(6):3435–3443. doi: 10.1128/jb.172.6.3435-3443.1990

Studies of sigma D-dependent functions in Bacillus subtilis.

L M Márquez 1, J D Helmann 1, E Ferrari 1, H M Parker 1, G W Ordal 1, M J Chamberlin 1
PMCID: PMC209155  PMID: 2111808

Abstract

Gene expression in Bacillus subtilis can be controlled by alternative forms of RNA polymerase programmed by distinct sigma factors. One such factor, sigma D (sigma 28), is expressed during vegetative growth and has been implicated in the transcription of a regulon of genes expressed during exponential growth and the early stationary phase. We have studied several functions related to flagellar synthesis and chemotaxis in B. subtilis strains in which sigma D is missing or is present at reduced levels. Previous studies showed that a null mutant, which contains a disrupted copy of the sigma D structural gene (sigD), fails to synthesize flagellin and grows as long filaments. We now show that these defects are accompanied by the lack of synthesis of the methyl-accepting chemotaxis proteins and a substantial decrease in two autolysin activities implicated in cell separation. A strain containing an insertion upstream of the sigD gene that reduces the level of sigma D protein grew as short chains and was flagellated but was impaired in chemotaxis and/or motility. This reduced level of sigma D expression suggests that the sigD gene may be part of an operon. A strain containing an insertion downstream of the sigD gene expressed nearly wild-type levels of sigma D protein but was also impaired in chemotaxis and/or motility, suggesting that genes downstream of sigD may also be involved in these functions. Genetic experiments demonstrate that sigD is allelic to the flaB locus, which was initially isolated as a locus affecting flagellin expression (G. F. Grant and M. I. Simon, J. Bacteriol. 99:116-124, 1969).

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These references are in PubMed. This may not be the complete list of references from this article.

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