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Two extragenic suppressor mutations, sur0B20 and sur0F1, which restore the sporulation of spo0B or spo0F mutants of Bacillus subtilis to the wild-type level, were obtained. These suppressor mutations were located in the spo0A gene. Their location is close to that of the sof-1 mutation, which suppresses spo0B, spo0E and spo0F mutations. However, spo0 strains bearing the sur0B20 mutation differed in several phenotypic characteristics from spo0 mutants bearing the sof-1 suppressor. Nucleotide sequence analysis revealed that the sur0B20 and sur0F1 mutations resulted in Glu14 to Val and Asn12 to Lys conversion, respectively, in the spo0A gene. This result indicates that sur0B20 is a new suppressor of spo0b and spo0F mutations, whereas sur0F1 is identical to sof-1.

New Suppressor Mutation sur0B of spo0B and spo0F Mutations in Bacillus subtilis