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J Bacteriol. 1991 June; 173(11): 3282-3290

research-article

Genetic evidence for interaction of sigma A with two promoters in Bacillus subtilis.

T J Kenney and C P Moran Jr

Department of Microbiology and Immunology, Emory University School of Medicine, Atlanta, Georgia 30322.

ABSTRACT

The specificity of promoter binding by RNA polymerase is governed by the sigma subunit. Recent studies, in which single-amino-acid substitutions in sigma factors have been found to suppress the effects of specific base pair substitutions in promoters, support the model that these sigma factors make sequence-specific contacts with nucleotides at the -10 and -35 regions of promoters. We found that single-amino-acid substitutions in the putative -35 region and -10 region recognition domains of sigma A specifically suppressed the effects of mutations in the -35 and -10 regions, respectively, of two promoters that are expressed in exponentially growing Bacillus subtilis. These mutations change the specificity of sigma A, the primary sigma factor in growing B. subtilis, and demonstrate that this sigma factor interacts with promoters in a manner similar to that of its homolog in Escherichia coli, sigma 70. These mutant derivatives of sigma A also provide a tool that may be useful for determining whether sigma A uses specific promoters in vivo.

J Bacteriol. 1991 June; 173(11): 3282-3290




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