Purification and Characterization of a Cytotonic Protein Expressed In Vitro by the Live Cholera Vaccine Candidate CVD 103-HgR

AUTOR(ES)

Sathyamoorthy, Venugopal

FONTE

American Society for Microbiology

RESUMO

Cholera vaccines developed by the deletion of CTX genes from Vibrio cholerae induce a residual reactogenicity in up to 10% of vaccinees. A novel cytotonic agent named secreted CHO cell elongating protein (S-CEP) was purified from culture supernatants of CVD 103-HgR (Levine et al., Lancet ii:467–470, 1988). Five fractionation steps yielded electrophoretically pure S-CEP with an Mr of 79,000. A partially purified preparation caused fluid accumulation in the sealed infant mouse model. The amino terminus bore a unique sequence with strong homology to a cytotonic toxin of El Tor V. cholerae.

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