Vibrio hollisae produces a hemolysin (Vh-rTDH) that is related to the thermostable direct hemolysin of Vibrio parahaemolyticus (Vp-TDH). Although both hemolysins are essentially similar biologically and immunologically, they differ markedly in heat stability; Vp-TDH is heat stable, whereas Vh-rTDH is heat labile. To elucidate the relationships between their characteristics and molecular structures, we analyzed the amino acid sequence of Vh-rTDH and compared it with that of Vp-TDH. Vh-rTDH consisted of 165 residues, of which 23 residues, spread over the peptide chain, differed from those of Vp-TDH
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