1887

Abstract

Summary: Mutants of ATCC 8185 were isolated which were unable to produce detectable amounts of either tyrocidine or linear gramicidin, or both peptide antibiotics. Tyrocidine-negative mutants (BM5, BM21, BM44) sporulated normally. Gramicidin-negative mutants (BM2, BM24) were oligosporogenous, and mutants unable to produce both peptides (S18, S19) were asporogenous. Addition of tyrocidine and/or gramicidin to asporogenous mutants in rich medium did not stimulate sporulation. However, these mutants formed normal spores after being transferred to nitrogen-free medium and upon the addition of tyrocidine. It was demonstrated that nutrient broth has a suppressive effect on tyrocidine-induced sporulation of S18. The tyrocidine-negative mutant BM44, sporogenous in rich medium, could sporulate under nitrogen deprivation only if supplemented with tyrocidine. The significance of the peptide antibiotics for a regulatory role in sporogenesis of is discussed.

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/content/journal/micro/10.1099/00221287-130-4-747
1984-04-01
2019-10-20
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http://instance.metastore.ingenta.com/content/journal/micro/10.1099/00221287-130-4-747
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