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Yeosuana aromativorans gen. nov., sp. nov., a mesophilic marine bacterium belonging to the family Flavobacteriaceae, isolated from estuarine sediment of the South Sea, Korea

Marine Biotechnology Research Centre, Korea Ocean Research and Development Institute, PO Box 29 Ansan, 425-600, Republic of Korea

Correspondence
Sang-Jin Kim
s-jkim{at}kordi.re.kr

A marine bacterium, GW1-1^T, capable of degrading benzo[a]pyrene (BaP), was isolated from estuarine sediments of the South Sea (the Korea Strait), Korea, after an enrichment culture maintained for 2 years in a medium supplemented with a mixture of BaP and pyrene. The strain formed yellowish-brown colonies on marine agar 2216. Cells were strictly aerobic, non-motile, Gram-negative rods and produced non-diffusible carotenoid pigments. Optimal growth occurred in the presence of 1 % (w/v) NaCl and at pH 7 and 33–36 °C. No growth occurred without supplementation with either CaCl₂ or MgCl₂, even in the presence of NaCl. Phylogenetic analysis based on the nearly complete sequence of the 16S rRNA gene revealed that the isolate formed a phyletic lineage with the genera Gelidibacter (93·9–94·7 % gene sequence similarity), Subsaximicrobium (93·3 %) and Subsaxibacter (93·9 %). The isolate also showed high sequence similarities to Gaetbulibacter saemankumensis (94·5 %), Algibacter lectus (94·2 %), members of the genus Bizionia (93·6–94·3 %) and Formosa algae (93·2 %), even though it belonged to a different phyletic line. The major respiratory quinones of the isolate were menaquinones MK-5 and MK-6. The DNA G+C content was 51·4 mol%. Dominant fatty acids were i-15 : 0, a-15 : 0, i-15 : 110c and 16 : 1. On the basis of this polyphasic taxonomic evidence, strain GW1-1^T is classified as a member of a novel genus and species in the family Flavobacteriaceae, for which the name Yeosuana aromativorans gen. nov., sp. nov. is proposed. The type strain of the type species is GW1-1^T (=KCCM 42019^T=JCM 12862^T).

Published online ahead of print on 18 November 2005 as DOI 10.1099/ijs.0.64073-0.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain GW1-1^T is AY682382.

Graphs showing the degradation rates of BaP by strain GW1-1^T and HPLC analysis of the major respiratory quinones and an additional phylogenetic tree are available as supplementary figures in IJSEM Online.

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