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1 Department of Plant Biotechnology, Biotechnology Research Center, University of Tokyo, 1-1-1 Yayoi Bunkyo-ku, Tokyo, Japan
2 School of Pharmaceutical Science, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
Correspondence
Kyung-Bum Lee
arirang{at}mail.ecc.u-tokyo.ac.jp
Phylogenetic analysis of the class ‘Alphaproteobacteria’, including physiologically diverse species, was conducted by using small-subunit rRNA gene sequences. The 16S rRNA gene sequences of 261 species in the class ‘Alphaproteobacteria’ were obtained from GenBank/EMBL/DDBJ for constructing a phylogenetic tree by using maximum-likelihood analysis. In the resulting tree, members of the class ‘Alphaproteobacteria’ were subdivided into five major clusters, which were compared with the taxonomic outline of Bergey's Manual of Systematic Biology and the ARB tree. Based on this phylogenetic tree, three novel families are proposed: Hyphomonadaceae fam. nov. to accommodate the bacterial genera Hyphomonas, Hirschia, Maricaulis and Oceanicaulis, Xanthobacteraceae fam. nov. to include the genera Xanthobacter, Azorhizobium, Ancylobacter, Labrys and Starkeya, and Erythrobacteraceae fam. nov. to accommodate the genera Erythrobacter, Porphyrobacter and Erythromicrobium. The phylogenetic tree of 16S rRNA gene sequences established in this study may provide a sound basis for future taxonomic reconstruction of the class ‘Alphaproteobacteria’.
Published online ahead of print on 6 May 2005 as DOI 10.1099/ijs.0.63663-0.
A full version of Fig. 1 is available as supplementary material in IJSEM Online.
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