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Phylogenetic relationships of three amino-acid-utilizing anaerobes, Selenomonas acidaminovorans, ‘Selenomonas acidaminophila’ and Eubacterium acidaminophilum, as inferred from partial 16S rDNA nucleotide sequences and proposal of Thermanaerovibrio acidaminovorans gen. nov., comb. nov. and Anaeromusa acidaminophila gen. nov., comb. nov.

¹ Laboratoire ORSTOM de Microbiologic des Anaérobies, Université de Provence, CESB-ESIL Case 925, 163 Avenue de Luminy, 13288 Marseille Cedex 9, France
² Departamento de Biologia, Pontificia Universidad Javeriana, POB 56710, SantaFe de Bogota, Colombia
³ School of Biomolecular and Biomedical Sciences, Faculty of Science, Griffith University, Brisbane, Queensland 4111, Australia

Author for correspondence: Bharat K. C. Patel. Tel: +61 417 726 671. Fax: +61 7 3875 7656. e-mail: bharat{at}genomes.sci.gu.edu.au

ABSTRACT

16S rRNA gene sequences of three previously described amino-acid-fermenting anaerobes, Selenomonas acidaminovorans, ‘Selenomonas acidaminophila’ and Eubacterium acidaminophilum, were determined. All three were found to cluster within the Clostridium and related genera of the subphylum of the Gram-positive bacteria. The thermophile, S. acidaminovorans, formed an individual line of descent and was equidistantly placed between Dethiosulfovibrio peptidovorans and Anaerobaculum thermoterrenum (similarity of 85%), both of which also form single lines of descent. ‘S. acidaminophila’ was related to Clostridium quercicolum, a member of cluster IX, with a similarity of 90%, whereas E. acidaminophilum was closely related to Clostridium litorale (similarity of 96%) as a member of cluster XI. Based on the phylogenetic data presented in this report and the phenotypic descriptions of these bacteria published previously, it is recommended that S. acidaminovorans be transferred to a new genus, Thermanaerovibrio gen. nov., as Thermanaerovibrio acidaminovorans comb. nov. and ‘Selenomonas acidaminophila’ be transferred to a new genus, Anaeromusa gen. nov., as Anaeromusa acidaminophila comb. nov. Though the transfer of E. acidaminophilum to a new taxon is justified, this is not recommended until the taxonomic status of all the members of cluster XI has been reviewed.

Key Words: amino acids • 16S rRNA analysis • Selenomonas • Eubacterium

The GenBank accession numbers for the 16S rRNA gene sequences of Thermanaerovibrio acidaminovorans, Anaeromusa acidaminophila and Eubacterium acidaminophilum are AF071414, AF071415 and AF071416, respectively.

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