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J Clin Microbiol. 1989 August; 27(8): 1782-1786

Characterization of Aeromonas sobria hemolysin by use of monoclonal antibodies against Aeromonas hydrophila hemolysins.

Department of Veterinary Science, College of Agriculture, University of Osaka Prefecture, Japan.

ABSTRACT

Aeromonas sobria produces hemolysin in a form activable with trypsin under defined cultural conditions. In immunoblotting analyses with the culture supernatant of A. sobria, the monoclonal antibody reacting specifically to Aeromonas hydrophila CA-11 hemolysin bound to the 53,000- and 49,000-dalton bands before and after trypsinization, respectively. The monoclonal antibody reacting to A. hydrophila AH-1 hemolysin did not bind either band. A. sobria hemolysin is, therefore, related antigenically to CA-11 hemolysin, while the molecular weights before and after activation differ from those of A. hydrophila hemolysins, being 54,000 and 51,000, respectively. The hemolytic and enterotoxigenic activities of A. sobria hemolysin were both neutralized by the monoclonal antibody against CA-11 hemolysin. It seems, therefore, that the same site on A. sobria hemolysin is responsible for both biological activities.

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