title: Characterization of a new thermostable direct haemolysin produced by a Kanagawa-phenomenon-negative clinical isolate of Vibrio parahaemolyticus.
abstract: The production of two haemolysins, thermostable direct haemolysin (Vp-TDH) and a Vp-TDH-related haemolysin (Vp-TRH), by clinical isolates of Vibrio parahaemolyticus has previously been reported. Here we describe a third type of haemolysin (named Vp-TDH/I), which is produced by a clinical isolate (strain TH012) that is Kanagawa phenomenon negative. Vp-TDH/I was purified by a series of column chromatographies on DEAE-Sephadex A25, hydroxyapatite, Sepharose 4B and Mono Q. By physicochemical, biological and immunological analyses, Vp-TDH/I was demonstrated to be similar, but not identical, to Vp-TDH and Vp-TRH. The gene encoding Vp-TDH/I was cloned and the deduced amino acid sequence of Vp-TDH/I confirmed that Vp-TDH/I has a sequence different from those of previously known Vp-TDH and Vp-TRH. Not only purified Vp-TDH/I but also live cells of the Vp-TDH/I-producing strain induced fluid accumulation in ligated rabbit intestine. We conclude that this clinical isolate produces a new type of Vp-TDH-related haemolysin, which may be involved in the pathogenesis of this organism.
authors.affiliation: Research Institute for Microbial Diseases, Osaka University, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Honda
authors.forename: M A
authors.initials: MA
authors.lastname: Abad-Lapuebla
authors.forename: Y X
authors.initials: YX
authors.lastname: Ni
authors.forename: K
authors.initials: K
authors.lastname: Yamamoto
authors.forename: T
authors.initials: T
authors.lastname: Miwatani
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001427:Bacterial Toxins; D001483:Base Sequence; D003001:Cloning, Molecular; D006460:Hemolysin Proteins / Q000737:chemistry* / Q000235:genetics / Q000302:isolation & purification / Q000494:pharmacology / Q000633:toxicity; D006461:Hemolysis; D006801:Humans; D008969:Molecular Sequence Data; D013696:Temperature; D014736:Vibrio parahaemolyticus / Q000378:metabolism / Q000472:pathogenicity*
chemical_list: D001427:Bacterial Toxins; D006460:Hemolysin Proteins; C068489:thermostable direct hemolysin