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16S rRNA Gene Sequence of Rubrobacter radiotolerans and Its Phylogenetic Alignment with Members of the Genus Arthrobacter, Gram-Positive Bacteria, and Members of the Family Deinococcaceae

Graduate Department of Gene Science, Faculty of Science, Hiroshima University, Kagamiyama, Higashi-Hiroshima 739, Japan

^* Corresponding author. Mailing address: Division of Gene Chemistry, Graduate Department of Gene Science, Faculty of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739, Japan. Phone: 81-824-24-7458. Fax: 81-824-24-0733.

ABSTRACT

The nearly complete sequence of the 16S rRNA gene of an extremely highly radiotolerant bacterium, Rubrobacter radiotolerans(reclassified from Arthrobacter radiotolerans based on chemical characteristics), was determined by PCR amplification of the genomic DNA followed by cloning of the amplified gene and sequencing by the dideoxynucleotide method. The sequence was aligned with the sequences of members of the genus Arthrobacter and also with the sequences of representatives of the gram-positive bacteria having high G+C contents and the family Deinococcaceae(radioresistant micrococci and their relatives). The results of our phylogenetic analysis confirmed that R. radiotolerans is not a member of the Arthrobacter group and thus supported the previous reclassification. Moreover, although it is radioresistant and has a high G+C content, R. radiotolerans is more closely related to the gram-positive bacteria with high G+C contents than to the radioresistant members of the Deinococcaceae.

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