In order to clarify the usefulness of the
S10-GERMS (
S10-spc-alpha operon gene-encoded ribosomal protein mass spectrum) method for the discrimination of microbial isolates from the environment, the isolates with octylphenol polyethoxylate (OPEO
n)-degrading capability from several soils in Japan were classified into 4 biodegradation patterns based on different final metabolic toxicants. Some isolates were identified as genera
Chelatococcus and
Mesorhizobium which have never been reported as OPEO
n-degrading bacteria based on 16S rRNA gene sequences. The findings from this study demonstrate that the
S10-GERMS method successfully discriminates the isolates at the strain level in the genus
Pseudomonas. Moreover, this method is better than 16S rRNA gene sequence similarity because it precisely demonstrated that OPEO
n-degrading bacteria in the genera
Chelatococcus and
Mesorhizobium might be new species. The
S10-GERMS method is suggested as a useful tool for the discrimination and monitoring of man-made chemical-degrading bacteria isolated from the environment.
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