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. 1985 May;162(2):558–564. doi: 10.1128/jb.162.2.558-564.1985

Nucleotide sequence of the thermostable direct hemolysin gene of Vibrio parahaemolyticus.

M Nishibuchi, J B Kaper
PMCID: PMC218884  PMID: 3988703

Abstract

The gene encoding the thermostable direct hemolysin of Vibrio parahaemolyticus was characterized. This gene (designated tdh) was subcloned into pBR322 in Escherichia coli, and the functional tdh gene was localized to a 1.3-kilobase HindIII fragment. This fragment was sequenced, and the structural gene was found to encode a mature protein of 165 amino acid residues. The mature protein sequence was preceded by a putative signal peptide sequence of 24 amino acids. A putative tdh promoter, determined by its similarity to concensus sequences, was not functional in E. coli. However, a promoter that was functional in E. coli was shown to exist further upstream by use of a promoter probe plasmid. A 5.7-kilobase SalI fragment containing the structural gene and both potential promoters was cloned into a broad-host-range plasmid and mobilized into a Kanagawa phenomenon-negative V. parahaemolyticus strain. In contrast to E. coli, where the hemolysin was detected only in cell lysates, introduction of the cloned gene into V. parahaemolyticus resulted in the production of extracellular hemolysin.

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