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. 1986 Nov;54(2):415–420. doi: 10.1128/iai.54.2.415-420.1986

Hemolysin production and cloning of two hemolysin determinants from classical Vibrio cholerae.

K Richardson, J Michalski, J B Kaper
PMCID: PMC260177  PMID: 3021628

Abstract

The hemolytic activity of 20 classical and 3 El Tor strains of V. cholerae O1 was examined phenotypically and genetically. The El Tor strains lysed bovine, chicken, human, rabbit, and sheep erythrocytes (RBCs), while the classical strains lysed only chicken and rabbit RBCs. The assay was done with RBCs in Tris-NaCl buffer, since phosphate-buffered saline was found to inhibit hemolytic activity. Hemolytic activity in culture supernatants from El Tor strains was more sensitive to heat inactivation than that in supernatants from the classical strain 395. A gene library of strain 395 was examined for hemolytic activity, and two distinct hemolytic clones were identified. One clone appeared identical to the previously cloned hemolysin structural gene from El Tor V. cholerae, while the other did not hybridize to the El Tor hemolysin probe, had a unique restriction enzyme digestion pattern, and encoded a hemolysin whose activity differed from that of the El Tor hemolysin clones. We suggest that the hemolysin specified by the determinant originally cloned from an El Tor vibrio be designated hemolysin I and the second hemolysin, cloned from the classical vibrio, be designated hemolysin II.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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