Kaistella koreensis gen. nov., sp nov., a novel member of the Chryseobacterium-Bergeyella-Riemerella branch

Abstract

Gram-negative, non-spore-forming, rod-shaped, yellow-pigmented bacteria isolated from a freshwater stream in Korea were investigated to determine their taxonomic position. Complete 16S rRNA gene sequence analysis indicated that the organisms should be placed in the Chryseobacterium-Bergeyella-Riemerella branch in the family Flavobacteriaceae. Phylogenetically, the strains were most closely related to Chryseobacterium balustinum ATCC 33487 T and Chryseobacterium scophthalmum LMG 13028(T) (94(.)3 and 94(.)1% 16S rRNA gene sequence similarity, respectively) and they clustered on a separate well-supported branch. The strains contained menaquinone MK-6 as the predominant respiratory quinone and showed higher G + C contents (41(.)7 mol%) than other species in the Chryseobacterium-Bergeyella-Riemerella branch and i-C-15:0 as a major fatty acid (47-52%). The phylogenetic distances from any species with validly published names and their phenotypic properties confirmed that the strains constitute a separate species in a new genus, for which the name Kaistella koreensis gen. nov., sp. nov. is proposed (type strain Chj707(T) = KCTC 12107(T) = IAM 15050(T)).