Abstract:
:Strains HM2-1 and HM2-2(T) were isolated from the faeces of a healthy infant and were characterized by determining their phenotypic and biochemical features and phylogenetic positions based on partial 16S rRNA gene sequence analysis. They were Gram-positive, obligately anaerobic, non-spore-forming, non-gas-producing, and catalase-negative non-motile rods. They did not grow at 15 or 45 °C in anaerobic bacterial culture medium, and their DNA G+C content was in the range 56-59 mol%. In enzyme activity tests, strains HM2-1 and HM2-2(T) were positive for α/β-galactosidases and α/β-glucosidases but negative for β-glucuronidase and cystine arylamidase. An analysis of the cell-wall composition of strains HM2-1 and HM2-2(T) revealed the presence of glutamic acid, alanine and lysine. The presence of fructose-6-phosphate phosphoketolase shows that isolates HM2-1 and HM2-2(T) are members of the genus Bifidobacterium. These two isolates belong to the same species of the genus Bifidobacterium. Strain HM2-2(T) was found to be related to Bifidobacterium catenulatum JCM 1194(T) (97.4 % 16S rRNA gene sequence identity: 1480/1520 bp), Bifidobacterium pseudocatenulatum JCM 1200(T) (97.2 %: 1472/1514 bp), Bifidobacterium dentium ATCC 27534(T) (96.7 %: 1459/1509 bp) and Bifidobacterium angulatum ATCC 27535(T) (96.5 %: 1462/1515 bp). The predominant cellular fatty acids of strains HM2-1 and HM2-2(T) were 16 : 0 and 18 : 1ω9c, with proportions greater than 18 % of the total. Phylogenetic analyses involving phenotypic characterization, DNA-DNA hybridization and partial 16S rRNA gene sequencing proves that the strains represent a novel species of the genus Bifidobacterium, for which the name Bifidobacterium kashiwanohense sp. nov. is proposed. The type strain is HM2-2(T) ( = JCM 15439(T) = DSM 21854(T)).
journal_name
Int J Syst Evol Microbiolauthors
Morita H,Nakano A,Onoda H,Toh H,Oshima K,Takami H,Murakami M,Fukuda S,Takizawa T,Kuwahara T,Ohno H,Tanabe S,Hattori Mdoi
10.1099/ijs.0.024521-0subject
Has Abstractpub_date
2011-11-01 00:00:00pages
2610-2615issue
Pt 11eissn
1466-5026issn
1466-5034journal_volume
61pub_type
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