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Muricauda flavescens sp. nov. and Muricauda aquimarina sp. nov., isolated from a salt lake near Hwajinpo Beach of the East Sea in Korea, and emended description of the genus Muricauda

¹ Korea Research Institute of Bioscience and Biotechnology (KRIBB), PO Box 115, Yusong, Taejon, Korea
² National Research Laboratory of Molecular Ecosystematics, Institute of Probionic, Probionic Corporation, Bio-venture Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), PO Box 115, Yusong, Taejon, Korea

Correspondence
Jung-Hoon Yoon
jhyoon{at}kribb.re.kr

Four Gram-negative, non-spore-forming, slightly halophilic rods (strains SW-62^T, SW-74, SW-63^T and SW-72) with appendages were isolated from a salt lake near Hwajinpo Beach on the East Sea in Korea, and subjected to a polyphasic taxonomic analysis. Phylogenetic analyses based on 16S rRNA gene sequences showed that strains SW-62^T, SW-74, SW-63^T and SW-72 formed a coherent cluster with Muricauda ruestringensis. Strains SW-62^T and SW-74 had the same 16S rRNA gene sequence, as did strains SW-63^T and SW-72. The level of 16S rRNA gene sequence similarity between strains SW-62^T and SW-63^T was 97·0 %. Strains SW-62^T and SW-63^T exhibited 16S rRNA gene similarity levels of 96·5 and 98·3 %, respectively, with respect to M. ruestringensis DSM 13258^T. The predominant isoprenoid quinone found in the four isolates and M. ruestringensis DSM 13258^T was MK-6. The four strains contained iso-C_{17 : 0} 3-OH, iso-C_{15 : 1} and iso-C_{15 : 0} as the major fatty acids. Their DNA G+C contents were 44·1–45·4 mol%. The levels of DNA–DNA relatedness indicated that strains SW-62^T and SW-74 and strains SW-63^T and SW-72 were members of two species that were different from M. ruestringensis. On the basis of phenotypic and phylogenetic data and genomic distinctiveness, strains SW-62^T and SW-74 and strains SW-63^T and SW-72 were placed in the genus Muricauda as two distinct novel species, for which the names Muricauda flavescens sp. nov. (type strain, SW-62^T=KCCM 41645^T=JCM 11812^T) and Muricauda aquimarina sp. nov. (type strain, SW-63^T=KCCM 41646^T=JCM 11811^T), respectively, are proposed.

Published online ahead of print on 3 December 2004 as DOI 10.1099/ijs.0.03051-0.

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains SW-62^T, SW-74, SW-63^T and SW-72 are AY445073, AY445074, AY445075 and AY445076, respectively.

Transmission electron micrographs showing the appendages found on most cells of strains SW-62^T, SW-74, SW-63^T and SW-72 are available as supplementary material in IJSEM Online.

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