Sporulation and Spore Properties of Bacillus brevis and its Gramicidin S-negative Mutant

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Abstract
The function(s) of the peptide antibiotic, gramicidin S, in its producer, B. brevis Nagano, was investigated. Particular attention was paid to the possible role of gramicidin S in sporulation and spore properties. Sporulation was similar in the gramicidin S-producing parental strain and a gramicidin S-negative mutant of this strain. Mature parental and mutant spores were equally resistant to UV irradiation, solvents (reported previously) and heat. The lack of gramicidin S synthesis impairs none of these properties. Contrary to results reported by others, no difference was found in heat resistance between spores of B. brevis ATCC 8185 and its linear gramicidin-negative mutant, M1.

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