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J Bacteriol. 1985 May; 162(2): 510-515

Cloning and expression in Escherichia coli of Vibrio parahaemolyticus thermostable direct hemolysin and thermolabile hemolysin genes.

ABSTRACT

Two hemolysin genes of Vibrio parahaemolyticus WP1, a thermostable direct (TSD) hemolysin gene and a thermolabile hemolysin gene, were cloned into the pBR322 vector in Escherichia coli K-12 C600. A large amount of the TSD hemolysin produced in E. coli K-12 accumulated in the periplasmic space. The TSD hemolysin gene was localized on a 0.9-kilobase HindIII-BamHI fragment by identifying qualitatively the production of the TSD hemolysin by a reverse passive hemagglutination assay in the osmotic shock fluid. The thermolabile hemolysin gene was isolated on a 1.3-kilobase HindIII-PstI fragment by selection with the hemolysin on blood agar. Southern blot hybridization and colony hybridization experiments indicated that the TSD hemolysin gene was present in the chromosomal DNA of 15 Kanagawa phenomenon-positive strains but not in 14 negative strains, whereas the thermolabile hemolysin gene was detected in all strains. No homologous DNA sequences to TSD and thermolabile hemolysin genes were detected in the chromosomes of Vibrio cholerae, Vibrio vulnificus, non-O1 V. cholerae, and Vibrio anguillarum.

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