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Porphyrobacter dokdonensis sp. nov., isolated from sea water

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

Correspondence
Jung-Hoon Yoon
jhyoon{at}kribb.re.kr
Tae-Kwang Oh
otk{at}kribb.re.kr

A Gram-negative, non-motile, non-spore-forming, slightly halophilic bacterial strain, DSW-74^T, was isolated from sea water off the island of Dokdo, Korea, and its taxonomic position was investigated by a polyphasic study. Strain DSW-74^T grew optimally at 37 °C and in the presence of 2 % (w/v) NaCl. It contained Q-10 as the predominant ubiquinone and C_{17 : 1}6c and C_{18 : 1}7c as the major fatty acids. Its DNA G+C content was 65.8 mol%. Phylogenetic analyses based on 16S rRNA gene sequences revealed that strain DSW-74^T was most closely related to Porphyrobacter species. Similarity values between the 16S rRNA gene sequence of strain DSW-74^T and those of the type strains of recognized Porphyrobacter species and of Erythromicrobium ramosum were in the range 97.4–98.7 %. Strain DSW-74^T exhibited 16S rRNA gene sequence similarity values of <97.5 % to recognized Erythrobacter species and the other species used in the phylogenetic analysis. DNA–DNA relatedness levels and differential phenotypic properties made it possible to categorize strain DSW-74^T as representing a novel Porphyrobacter species. On the basis of the taxonomic data presented, it is proposed that DSW-74^T (=KCTC 12395^T=DSM 17193^T) should be classified in the genus Porphyrobacter as the type strain of a novel species, Porphyrobacter dokdonensis sp. nov.

Published online ahead of print on 31 December 2005 as DOI 10.1099/ijs.0.63840-0.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain DSW-74^T is DQ011529.

A figure showing the absorption spectra of sonicated cell extract and acetone–methanol cell extract of strain DSW-74^T is available as supplementary material in IJSEM Online.

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