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Aminiphilus circumscriptus gen. nov., sp. nov., an anaerobic amino-acid-degrading bacterium from an upflow anaerobic sludge reactor

¹ Unidad de Saneamiento y Biotecnología Ambiental, Departamento de Biología, Pontificia Universidad Javeriana, POB 56710, Bogotá, Colombia
² IRD, UR 101 Extremophiles, IFR-BAIM, Universités de Provence et de la Mediterranée, ESIL, Marseille, France
³ Microbial Gene Research and Resources Facility, School of Biomolecular and Biomedical Sciences, Faculty of Science, Griffith University, Brisbane, Queensland 4111, Australia

Correspondence
S. Baena
baena{at}javeriana.edu.co

Strain ILE-2^T was isolated from an upflow anaerobic sludge bed reactor treating brewery wastewater. The motile, non-sporulating, slightly curved cells (2–4x0.1 µm) stained Gram-negative and grew optimally at 42 °C and pH 7.1 with 0.5 % NaCl. The strain required yeast extract for growth and fermented Casamino acids, peptone, isoleucine, arginine, lysine, alanine, valine, glutamate, histidine, glutamine, methionine, malate, fumarate, glycerol and pyruvate to acetate, propionate and minor amounts of branched-chain fatty acids. Carbohydrates, formate, acetate, propionate, butyrate, isovalerate, methanol, ethanol, 1-propanol, butanol, lactate, succinate, starch, casein, gelatin, xylan and a number of other amino acids were not utilized. The DNA G+C content of strain ILE-2^T was 52.7 mol%. 16S rRNA gene sequence analysis revealed that ILE-2^T was distantly related to members of the genera Aminobacterium (83 % similarity) and Aminomonas (85 % similarity) in the family Syntrophomonadaceae, order Clostridiales, phylum Firmicutes. On the basis of the results of our polyphasic analysis, strain ILE-2^T represents a novel species and genus within the family Syntrophomonadaceae, for which the name Aminiphilus circumscriptus gen. nov., sp. nov. is proposed. The type strain of Aminiphilus circumscriptus is ILE-2^T (=DSM 16581^T =JCM 14039^T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain ILE-2^T is AY642589.

A phase-contrast photomicrograph of cells of strain ILE-2^T is available as supplementary material with the online version of this paper.

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