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Sequences of the RNase P RNA gene were investigated for the phylogenetic analysis of the genus Saccharomonospora. Aligned nucleotide sequences, determined from the PCR-amplified RNase P RNA gene of representative strains of the genus Saccharomonospora, displayed 94·2±1·3% interspecific variances. The intraspecific similarity value was 99·7–100% in all species tested. Saccharomonospora azurea K161Tand “Saccharomonospora caesia” K76Tdisplayed identical RNase P RNA gene sequences in the region that was determined and Saccharomonospora sp. K180 showed sequences distinct from validly described species with a similarity value of 94·6±1·0%. The phylogenetic trees constructed by aligning the sequences either within the genus Saccharomonospora or with other Gram-positive bacteria were similar to the ones derived using sequences of the 16S rDNA gene. Advantageous features of this gene for application as a molecular phyletic marker are discussed.
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