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Antisera against the broad-spectrum peptide antibiotic AS-48 produced by Enterococcus faecalis were obtained from immunized rabbits. Appreciable antibody titers were obtained only after repeated immunization, suggesting a feeble antigenicity for AS-48. Upon incubation with AS-48, the antisera neutralized its bacteriolytic action on E. faecalis S-47, although the simultaneous addition of AS-48 and serum did not prevent lysis. Crude serum cross-reacted with outer envelope components of enterococci, although specific anti-AS-48 antibodies, purified by affinity chromatography, reacted only with AS-48-treated cells. Labelling with immunofluorescence and colloidal gold particles was carried out on sensitive and resistant bacterial species to determine the interaction of AS-48 with cell structures.
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