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Int J Syst Evol Microbiol 59 (2009), 1793-1797; DOI  10.1099/ijs.0.002519-0
© 2009 International Union of Microbiological Societies

Parasutterella excrementihominis gen. nov., sp. nov., a member of the family Alcaligenaceae isolated from human faeces

Fumiko Nagai, Masami Morotomi, Hiroshi Sakon and Ryuichiro Tanaka

Yakult Central Institute for Microbiological Research, 1796 Yaho, Kunitachi, 186-8650 Tokyo, Japan

Correspondence
Fumiko Nagai
fumiko-nagai{at}yakult.co.jp

A novel, strictly anaerobic, non-spore-forming, Gram-negative coccobacillus (strain YIT 11859T) was isolated from human faeces. Biochemically, this strain was largely unreactive and was asaccharolytic. Growth of strain YIT 11859T in peptone-yeast extract broth produced no visible turbidity, and a trace amount of propionate was detected as an end product of metabolism. 16S rRNA gene sequence analysis showed that strain YIT 11859T was related most closely to the type strains of Sutterella species, with 90.8–88.0 % sequence similarity. Phylogenetic analysis of these and other related sequences confirmed that strain YIT 11859T was phylogenetically most closely associated with Sutterella species, but formed a separate cluster, indicating that strain YIT 11859T represents a novel member of the family Alcaligenaceae. Fatty acid analysis demonstrated the presence of a high concentration of C18 : 1{omega}9c (75 % of the total). The main respiratory quinones were menaquinone (MK–6) and methylated menaquinone (MMK-6). The G+C content of the DNA was 49.8 mol%. These results suggest that strain YIT 11859T represents a novel species of a new genus, for which the name Parasutterella excrementihominis gen. nov., sp. nov. is proposed. The type strain of Parasutterella excrementihominis is YIT 11859T (=DSM 21040T =JCM 15078T).

Abbreviations: FAME, fatty acid methyl ester; ML, maximum likelihood; MP, maximum parsimony

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain YIT 11859T is AB370250.

Maximum-likelihood and maximum-parsimony phylogenetic trees based on 16S rRNA gene sequences and a table giving the cellular fatty acid compositions of strain YIT 11859T and the type strains of related type species in the family Alcaligenaceae are available as supplementary material with the online version of this paper.




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