A single-step method for the purification of the heat-labile enterotoxin of E. coli is described. The method involves an affinity immunoadsorbent made with antiserum to cholera toxin. Crude toxin preparations of three human and one porcine enterotoxinogenic strains of E. coli were purified on this immunoadsorbent, and the elution products suggest that the toxin molecule is composed of subunits. One kind of subunit shared by these four strains showed similar mobility of sodium dodecyl sulfate-polyacrylamide gel electrophoresis, close antigenic relationship, and an antigen in common with cholera enterotoxin.
ASJC Scopus subject areas
- Infectious Diseases