A Bacillus subtilis spore coat polypeptide gene, cotS.

Microbiology
Akiko AbeK Watabe

Abstract

A gene, cotS, encoding a spore coat polypeptide of Bacillus subtilis, was isolated from an EcoRI fragment (5.4 kb) of the chromosome by using synthetic oligonucleotide probes corresponding to the NH2-terminal amino acid sequence of Cot40-2 previously purified from the spore coat of B. subtilis. The nucleotide sequence (2603 bp) was determined and sequence analysis suggested the presence of two contiguous ORFs, ORF X and cotS, followed by the 5'-region of an additional ORF, ORF Y, downstream of cotS. The cotS gene is 1053 nucleotides long and encodes a polypeptide of 351 amino acids with a predicted molecular mass of 41083 Da. The predicted amino acid sequence was in complete agreement with the NH2-terminal amino acid sequence of Cot40-2. The orfX gene is 1131 nucleotides long and encodes a polypeptide of 377 amino acids with a predicted molecular mass of 42911 Da. The gene product of cotS was confirmed to be identical to Cot40-2 by SDS-PAGE and immunoblotting from Escherichia coli transformed with a plasmid containing the cotS region. Northern hybridization analysis indicated that a transcript of cotS and orfX appeared at about 5 h after the onset of sporulation. The transcriptional start point determined by primer extension an...Continue Reading

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