Ezakiella peruensis gen. nov., sp. nov. isolated from human fecal sample from a coastal traditional community in Peru

Abstract

A novel Gram-stain positive, non-motile, non-sporeforming coccus-shaped, obligately anaerobic bacterium was isolated from a fecal sample of an individual residing in a traditional Peruvian community. The organism was characterized using biochemical, chemotaxonomic and phylogenetic methods. Comparative 16S rRNA gene sequence analyses and phenotypic characteristics demonstrated that the organism was biochemically and phenotypically related, but distinct, from a group of organisms referred to as the Gram-stain positive anaerobic cocci (GPAC). The major cellular fatty acids of the novel isolate were determined to be C16:0 (18.3%), C18:1ω9c (39.8%), C18:2ω6,9c/C18:0 ANTE (13.2%). Fermentation end products from PYG are acetate and formate. Cell-wall peptidoglycan was found to be A4α (L-Lys-L-Ala-L-Glu) and the G + C content was determined to be 38.4 mol%. Based on the phenotypic, chemotaxonomic, and phylogenetic results, Ezakiella peruensis gen. nov., sp. nov., is now proposed. The type strain is M6.X2(T) (DSM 27367(T) = NBRC 109957 (T) = CCUG 64571(T)).

Keywords: 16S rRNA-phylogeny; Ezakiella peruensis gen. nov., sp. nov.; Taxonomy.

Fig. 1

Phylogenetic tree of 16S rRNA gene sequences indicating the position of Ezakiella peruensis gen. nov. sp. nov within members of related genera within the phylum Firmicutes. The tree was constructed using the neighbour-joining algorithm from MEGA (version 4) with Peptostreptococcus anaerobius as the outgroup. Bootstrap values (%) were obtained with 1000 replicates and are displayed on their relative branches.