Reaction of staphylococcal alpha-toxin with peptide-induced antibodies.

Infection and Immunity
S HarshmanF Baleux

Abstract

Two peptides representing separate 13-amino-acid sequences of staphylococcal alpha-toxin have been synthesized and acrylamide gel-purified alpha-toxin monomer and hexamer forms have been prepared and used to produce antisera in rabbits. We report here that each synthetic peptide, P-I and P-II, induces the formation of a specific precipitating antiserum. Moreover, these sera also react with the toxin monomer and sometimes with the hexamer, indicating that each peptide has more than one epitope. The purified toxin monomer can induce antibodies to fragments of toxin but is significantly less potent than the hexamer in inducing antibodies to the toxin monomer and almost not effective in inducing a response to the toxin hexamer. The purified toxin hexamer induces responses that are almost the reciprocals of the monomers, with the antihexamer and -monomer responses dominating and almost no responses to fragments of toxin being induced. These responses are interpreted in terms of the stability of the toxin hexamer to proteolytic degradation, compared with the relative sensitivity of the monomer to proteases. In assays of toxin-neutralization activity, only those sera containing antihexamer antibodies can block toxin hemolytic activity...Continue Reading

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Citations

Apr 7, 2010·Journal of Biomedicine & Biotechnology·Salvador Eugenio C Caoili
Sep 25, 2019·Toxins·Neža OmersaGregor Anderluh
Dec 1, 1991·Microbiological Reviews·S Bhakdi, J Tranum-Jensen
Sep 1, 1992·Infection and Immunity·S HarshmanJ R Snapper
Oct 13, 2012·Chemical Reviews·Ekaterina M Nestorovich, Sergey M Bezrukov

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