We analyzed ribosomal AT-L30 proteins from 11 type strains of wall chemotype IV actinomycete species which lack mycolic acids. The electrophoretic mobilities of the AT-L30 preparations from these strains, as determined by two-dimensional polyacrylamide gel electrophoresis, revealed that the genera , and can be separated from each other on the basis of the relative electrophoretic mobilities of their AT-L30 proteins. Overlapping relative electrophoretic mobilities were observed only for the genera and . The electrophoretic mobility of protein AT-L30 from was similar to the electrophoretic mobility of protein AT-L30 but not to the electrophoretic mobilities of the AT-L30 proteins of the reference genera. Our results confirm the taxonomic status of as a species of the genus and illustrate the efficacy of ribosomal protein analysis in actinomycete taxonomy.


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