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Porphyrobacter donghaensis sp. nov., isolated from sea water of the East Sea in Korea

Korea Research Institute of Bioscience and Biotechnology (KRIBB), PO Box 115, Yusong, Taejon, Korea

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

Two Gram-negative, motile, non-spore-forming, bacteriochlorophyll a-containing slightly halophilic strains, SW-132^T and SW-158, were isolated from sea water of the East Sea in Korea, and subjected to a polyphasic taxonomic study. The two isolates were characterized chemotaxonomically as having Q-10 as the predominant respiratory lipoquinone and major amounts of unsaturated fatty acids C_{18 : 1}7c and C_{17 : 1}6c. The DNA G+C contents of the two strains were in the range 66·8–65·9 mol%. The 16S rRNA gene sequences of strains SW-132^T and SW-158 were 99·9 % (1 nt difference) similar and their mean level of DNA–DNA relatedness was 86 %. The 16S rRNA gene sequence analysis showed that strains SW-132^T and SW-158 are phylogenetically closely related to Porphyrobacter species and Erythromicrobium ramosum. Similarities between the 16S rRNA gene sequences of strains SW-132^T and SW-158 and the type strains of Porphyrobacter species and E. ramosum ranged from 97·8 to 99·0 %. DNA–DNA relatedness data indicated that strains SW-132^T and SW-158 are members of a genomic species that is separate from the four Porphyrobacter species. On the basis of phenotypic and phylogenetic data and genetic distinctiveness, strains SW-132^T (=KCTC 12229^T=DSM 16220^T) and SW-158 (=KCTC 12230) are classified as a novel Porphyrobacter species, for which the name Porphyrobacter donghaensis sp. nov. is proposed.

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains SW-132^T and SW-158 are AY559428 and AY559429, respectively.

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