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Since the species classified in order Mycoplasmatales can be separated into at least six antigenically distinct groups by analytical serology, we compared the antigenic specificities of the adenosine triphosphatases (ATPases) and reduced nicotinamide adenine dinucleotide dehydrogenases of 14 strains by using quantitative immunoelectrophoresis and specific strains to identify enzymatically active precipitin peaks. The following species and serological groups were studied: Mycoplasma putrefaciens, Mycoplasma capricolum, and Mycoplasma species bovine group VII (group 1); Acholeplasma laidlawii and Acholeplasma equifetale (group 2); Mycoplasma gallisepticum (group 4); Mycoplasma pneumoniae (group 5); Mycoplasma felis (group 6); Mycoplasma arginini, Mycoplasma hominis, and Mycoplasma gallinarum (group 7); and Ureaplasma urealyticum (ungrouped). Each strain showed ATPase activity which formed a precipitin peak against the homologous antiserum. Eight serologically distinct ATPases were identified, and most of these ATPases cross-reacted only within serologically related clusters of species, not between clusters; the exception was group 7, where the ATPase of M. gallinarum had a different specificity than the cross-reacting enzymes of M. arginini and M. hominis. All species except U. urealyticum possessed a reduced nicotinamide adenine dinucleotide dehydrogenase, but the enzymes in M. felis, M. hominis, and M. arginini did not precipitate with any antisera. The remaining species showed five distinct specificities of reduced nicotinamide adenine dinucleotide dehydrogenases, and the antigenic relationships of these enzymes exactly paralleled those observed with ATPases. Thus, the serological specificities of common mycoplasmic enzymes are powerful taxonomic tools.

international journal of systematic bacteriology

Distinctive Antigenic Specificities of Adenosine Triphosphatases and Reduced Nicotinamide Adenine Dinucleotide Dehydrogenases as Means for Classification of the Order Mycoplasmatales