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Actibacter sediminis gen. nov., sp. nov., a marine bacterium of the family Flavobacteriaceae isolated from tidal flat sediment

¹ Department of Biotechnology and BET Institute, Chung-Ang University, Anseong 456-756, Republic of Korea
² School of Biological Sciences and Institute of Microbiology, Seoul National University, Seoul 151-742, Republic of Korea

Correspondence
Chang-Jun Cha
cjcha{at}cau.ac.kr

A yellow-pigmented, Gram-negative, aerobic bacterial strain comprising rod-shaped cells devoid of flagellar and gliding motility, designated strain JC2129^T, was isolated from tidal flat sediment of Dongmak on Ganghwa Island, South Korea. Results from a 16S rRNA gene sequence analysis indicated that the isolate belonged to the family Flavobacteriaceae; the highest level of nucleotide sequence similarity (91.9 %) occurred with Polaribacter dokdonensis DSW-5^T. The predominant cellular fatty acids were iso-C_{15 : 0} (19.8 %), iso-C_{15 : 1} G (14.0 %), iso-C_{17 : 0} 3-OH (13.7 %) and iso-C_{13 : 0} (6.4 %). Flexirubin-type pigments were absent. The major isoprenoid quinone was MK-6. The DNA G+C content was 43–45 mol%. Data from a polyphasic taxonomy study suggested that the isolate represents a novel genus and species in the family Flavobacteriaceae, for which the name Actibacter sediminis gen. nov., sp. nov. is proposed. The type strain of Actibacter sediminis is JC2129^T (=KCTC 12704^T =JCM 14002^T).

A transmission electron micrograph of a negatively stained cell of strain JC2129^T is shown as a supplementary figure available with the online version of this paper.

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