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. 1986 Jul;167(1):110–116. doi: 10.1128/jb.167.1.110-116.1986

Cloning and sequencing of the major intracellular serine protease gene of Bacillus subtilis.

Y Koide, A Nakamura, T Uozumi, T Beppu
PMCID: PMC212848  PMID: 3087947

Abstract

A Bacillus subtilis 2.7-kilobase DNA fragment containing an intracellular protease gene was cloned into Escherichia coli. The transformants produced an intracellular protease of approximately 35,000 Mr whose activity was inhibited by both phenylmethylsulfonyl fluoride and EDTA. Introduction of the fragment on a multicopy vector, pUB110, into B. subtilis caused a marked increase in the level of the intracellular protease. The nucleotide sequence of the cloned fragment showed the presence of an open reading frame for a possible proenzyme of the major intracellular serine protease (ISP-I) of B. subtilis with an NH2-terminal 17- or 20-amino-acid extension. The total amino acid sequence of the protease deduced from the nucleotide sequence showed considerable homology with that of an extracellular serine protease, subtilisin. The transcriptional initiation site of the ISP-I gene was identified by nuclease S1 mapping. No typical conserved sequence for promoters was found upstream of the open reading frame. An ISP-I-negative mutant of B. subtilis was constructed by integration of artificially deleted gene into the chromosome. The mutant sporulated normally in a nutritionally rich medium but showed decreased sporulation in a synthetic medium. The chloramphenicol resistance determinant of a plasmid integrated at the ISP-I locus was mapped by PBS1 transduction and was found to be closely linked to metC (99.5%).

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Selected References

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