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. 1987 Jan;55(1):49–56. doi: 10.1128/iai.55.1.49-56.1987

Shared epitopes between Mycoplasma pneumoniae major adhesin protein P1 and a 140-kilodalton protein of Mycoplasma genitalium.

J Morrison-Plummer, A Lazzell, J B Baseman
PMCID: PMC260279  PMID: 2432017

Abstract

Previous serological data have demonstrated cross-reactive antigens between two pathogenic species of mycoplasmas, M. pneumoniae and M. genitalium. Preliminary analysis of sera and monoclonal antibodies (MAbs) to protein antigens of these species showed an immunodominance of adhesin P1 (165 kilodaltons [kDa]) of M. pneumoniae in mice and hamsters and a 140-kDa protein of M. genitalium in mice and experimentally infected chimpanzees. To further characterize these two proteins, we assayed multiple anti-P1 and anti-140-kDa protein MAbs by enzyme-linked immunosorbent assay, immunoblot, and radioimmunoprecipitation techniques. The 140-kDa M. genitalium protein was shown to be surface accessible and insensitive to levels of trypsin which readily degrade protein P1. Peptide mapping was used to identify a unique class of MAbs which bound a cross-reactive molecule common to both the major adhesin protein P1 of M. pneumoniae and the 140-kDa protein of M. genitalium. MAbs generated against both M. pneumoniae and M. genitalium which were reactive with this determinant blocked M. pneumoniae attachment to chicken erythrocytes.

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