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Robiginitalea myxolifaciens sp. nov., a novel myxol-producing bacterium isolated from marine sediment, and emended description of the genus Robiginitalea

Hao Do Manh, Yoshihide Matsuo, Atsuko Katsuta, Satoru Matsuda, Yoshikazu Shizuri and Hiroaki Kasai

Marine Biotechnology Institute, 3-75-1 Heita, Kamaishi, Iwate 026-0001, Japan

Correspondence
Hiroaki Kasai
hkasai{at}kitasato-u.ac.jp

A marine, Gram-negative, deep-orange-coloured, rod/coccoid-shaped, strictly aerobic, non-motile, oxidase- and catalase-positive bacterial strain, designated YM6-073^T, was isolated from sediment collected in Okinawa, Japan. Strain YM6-073^T produced the carotenoid (3R,2'S)-myxol. A phylogenetic analysis based on 16S rRNA gene sequences revealed that strain YM6-073^T belonged to a distinct lineage in the family Flavobacteriaceae, the closest relative being Robiginitalea biformata HTCC2501^T (93.7 % sequence similarity). Strain YM6-073^T could be distinguished from other members of the family Flavobacteriaceae by means of a number of phenotypic characteristics. The DNA G+C content was 50.1 mol%. The predominant cellular fatty acids were iso-C_{15 : 0}, iso-C_{15 : 1}10c, iso-C_{17 : 0} 3-OH and C_{15 : 0,} and menaquinone-6 was the only respiratory quinone. DNA–DNA hybridization between strain YM6-073^T and R. biformata DSM 15991^T showed less than 10 % DNA–DNA relatedness. On the basis of phenotypic, genotypic and phylogenetic features, strain YM6-073^T represents a novel species of the genus Robiginitalea, for which the name Robiginitalea myxolifaciens sp. nov. is proposed. The type strain is YM6-073^T (=MBIC 06409^T=KCTC 22216^T=DSM 21019^T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain YM6-073^T is AB270585.

Detailed compositions of the isolation media and a more detailed phylogenetic tree are presented as supplementary material available with the online version of this paper.