Heterogeneity of Thymidine Kinase Among Species of Mycoplasma and Acholeplasma

The thymidine kinase activities present in nine strains (including four type strains and one neotype strain) of nine species of the genus Mycoplasma and two strains (including one type strain) of two species of the genus Acholeplasma were characterized with respect to migration in polyacrylamide gels and isoelectric point as determined by electrofocusing. There was a marked heterogeneity in the enzymes, not only between the two genera but also within each genus.