The hierarchical system of the 'Alphaproteobacteria': description of Hyphomonadaceae fam. nov., Xanthobacteraceae fam. nov. and Erythrobacteraceae fam. nov.
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'.
Lee
Kyung-Bum
KB
Department of Plant Biotechnology, Biotechnology Research Center, University of Tokyo, 1-1-1 Yayoi Bunkyo-ku, Tokyo, Japan.
Liu
Chi-Te
CT
Department of Plant Biotechnology, Biotechnology Research Center, University of Tokyo, 1-1-1 Yayoi Bunkyo-ku, Tokyo, Japan.
Anzai
Yojiro
Y
School of Pharmaceutical Science, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan.
Kim
Hongik
H
Department of Plant Biotechnology, Biotechnology Research Center, University of Tokyo, 1-1-1 Yayoi Bunkyo-ku, Tokyo, Japan.
Aono
Toshihiro
T
Department of Plant Biotechnology, Biotechnology Research Center, University of Tokyo, 1-1-1 Yayoi Bunkyo-ku, Tokyo, Japan.
Oyaizu
Hiroshi
H
Department of Plant Biotechnology, Biotechnology Research Center, University of Tokyo, 1-1-1 Yayoi Bunkyo-ku, Tokyo, Japan.
D020561:Alphaproteobacteria / Q000145:classification* / Q000235:genetics; D015373:Bacterial Typing Techniques; D001483:Base Sequence; D004269:DNA, Bacterial / Q000235:genetics; D004275:DNA, Ribosomal / Q000235:genetics; D020459:Genes, rRNA; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics*
D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D012336:RNA, Ribosomal, 16S