Abstract
We analyzed the ribosomal AT-L30 proteins from 13 type strains of species belonging to the genera Microbispora and Actinomadura. The electrophoretic mobilities of the AT-L30 preparations from Microbispora strains, as determined by two-dimensional polyacrylamide gel electrophoresis, revealed that the members of the genus Microbispora are phylogenetically homogeneous. The results of partial amino acid sequencing of AT-L30 preparations from several representative Microbispora strains supported the separation of the genus Microbispora from other related genera. The amino acid sequences of the AT-L30 proteins from strains of species belonging to the genus Actinomadura sensu stricto displayed a diversity that exemplified the low levels of amino acid sequence homology within the genus. This diversity was considered to be a characteristic typical of the genus Actinomadura.