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We have isolated and characterized an N-benzoyl-Val-Gly-Arg-p-nitroanilide-specific protease gene, designated prtH, from Bacteroides forsythus ATCC 43037. Nucleotide sequencing of the DNA insert from the clone (hereafter referred to as clone FST) revealed that the protease activity corresponded to an open reading frame consisting of 1,272 bp coding for a 47.8-kDa protein. When plasmid pFST was used as a probe in Southern hybridization, Sau3AI-digested chromosomal DNA of B. forsythus ATCC 43037 as well as the chromosomal DNAs of the isolated strains Ta4, TR5, and YG2 showed 0.6- and 0.8-kb hybridizing bands. The cell-free extracts of clone FST showed hemolytic activity on human blood cells. The hydrolytic activity of cell extracts of the pFST clone was inhibited by p-toluenesulfonyl-L-lysine chloromethyl ketone hydrochloride, leupeptin, N-ethylmaleimide, iodoacetic acid, iodoaceteamide, and EDTA.

Cloning, expression, and sequencing of a protease gene from Bacteroides forsythus ATCC 43037 in Escherichia coli