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Spores produced by a mutant of Bacillus subtilis were slow to develop their resistance properties during sporulation, and were slower to germinate than were wild-type spores. The coat protein composition of the mutant spores, as analysed by SDS-PAGE, was similar to that of the wild-type spores. However, one of the proteins (mol. wt 12000) which is normally present in the outer-most layers of mature wild-type spores and which is surface-exposed, was assembled abnormally into the coat of the mutant spores and not surface-exposed. The mutation responsible for this phenotype (spo-520) has been mapped between pheA and leuB on the B. subtilis chromosome, and was 47% cotransformable with leuB16. This mutation, and three others closely linked to it, define a new sporulation locus, spoVIB, which is involved in spore coat assembly. The phenotype of the mutant(s) supports the contention that spore germination and resistance properties may be determined by the assembly of the coat.

Altered Arrangement of Proteins in the Spore Coat of a Germination Mutant of Bacillus subtilis