An aberrant hemolysin produced by a Vibrio cholerae non-O1 strain N037 (N037-hly) was purified and characterized. N037-Hly was antigenically very similar to El Tor hemolysin but differed in molecular weight (48,000 vs. 60,000), interaction with glucose, and hemolytic activity. Of 100 V. cholerae non-O1 strains other than the N037 strain examined, none produced this aberrant hemolysin. The N-terminal amino acid sequence of N037-hly was highly homologous to that of El Tor hemolysin.
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Iwanaga et al. (1991) studied this question.
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