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Acetanaerobacterium elongatum gen. nov., sp. nov., from paper mill waste water

¹ State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100080, PR China
² Graduate School of the Chinese Academy of Sciences, Beijing 100080, PR China

Correspondence
Xiuzhu Dong
dongxz{at}sun.im.ac.cn

Two mesophilic anaerobic bacterial strains (Z7^T and Z1) were isolated from waste water sludge of the Xinanzhang paper mill, Beijing, China. The strains were Gram-positive, non-spore-forming and motile. Cells were thin rods (0·2–0·4x4·0–8·0 µm). Growth of the strains was observed at 20–42 °C and pH 5·0–7·5. Both strains hydrolysed gelatin and aesculin and fermented several kinds of mono-, di- and oligosaccharides. The fermentation end products formed from glucose were acetate, ethanol, hydrogen and carbon dioxide. The predominant cellular fatty acids were the branched-chain fatty acids isoC_{15 : 0} (42·83 %) and isoC_{14 : 0} (32·11 %). The DNA G+C contents of strains Z7^T and Z1 were 50·4 and 48·6 mol%, respectively. Phylogenetic analysis based on 16S rRNA gene sequences revealed that the isolates represent a new phyletic sublineage within the Clostridium leptum rRNA cluster, with <91 % 16S rRNA gene sequence similarity to currently described species. On the basis of polyphasic evidence from this study, Acetanaerobacterium elongatum gen. nov., sp. nov., a novel genus and species, is proposed, with strain Z7^T (=JCM 12359^T=AS 1.5012^T) as the type strain.

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of Acetanaerobacterium elongatum Z7^T and Z1 are AY487928 and AY518589, respectively.

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