Amino-acylation site mutations in amino acid-activating domains of surfactin synthetase: effects on surfactin production and competence development in Bacillus subtilis.
The part of the srfA operon of Bacillus subtilis that contains the region required for competence development is composed of the first four amino acid-activating domains which are responsible for the incorporation of Glu, Leu, D-Leu, and Val into the peptide moiety of the lipopeptide surfactin. Ser-to-Ala substitutions were made in the amino-acylation site of each domain, and their effects on surfactin production and competence development were examined. All of the mutations conferred a surfactin-negative phenotype, supporting the finding that the conserved Ser in the amino-acylation site is required for peptide synthesis. However, none of the mutations affected significantly competence development or the expression of a lacZ fusion to the late competence operon comG. This, coupled with recent findings that only the fourth, Val-activating, domain is required for competence, suggests that some activity, other than amino-acylation and perhaps unrelated to peptide synthesis, possessed by the fourth domain is involved in the role of srfA in regulating competence development.
Department of Biochemistry and Molecular Biology, Louisiana State University Medical Center, Shreveport 71130-3932.
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D'Souza
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Nakano
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Corbell
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Zuber
D000596:Amino Acids / Q000378:metabolism*; D000903:Antibiotics, Antineoplastic / Q000096:biosynthesis*; D001412:Bacillus subtilis / Q000201:enzymology / Q000235:genetics*; D001426:Bacterial Proteins / Q000096:biosynthesis*; D001483:Base Sequence; D004252:DNA Mutational Analysis; D055666:Lipopeptides; D008969:Molecular Sequence Data; D009154:Mutation; D009876:Operon / Q000235:genetics; D010453:Peptide Synthases / Q000235:genetics*; D010456:Peptides, Cyclic; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis; D015398:Signal Transduction / Q000235:genetics; D014170:Transformation, Genetic
D000596:Amino Acids; D000903:Antibiotics, Antineoplastic; D001426:Bacterial Proteins; D055666:Lipopeptides; D010456:Peptides, Cyclic; D011993:Recombinant Fusion Proteins; C009365:surfactin peptide; D010453:Peptide Synthases; C069542:surfactin synthetase