Paracoccus beibuensis sp. nov., Isolated from the South China Sea
A Gram-negative, non-motile, short rod-shaped or spherical bacterial strain that accumulates poly-β-hydroxybutyrate (PHB) granules was isolated from the Beibu Gulf in the South China Sea. Cells have no polar or subpolar flagella, dividing by binary fission. Phylogenetic analyses based on 16S rRNA gene sequences showed that the strain formed a monophyletic branch at the periphery of the evolutionary radiation occupied by the genus Paracoccus, family Rhodobacteraceae, order Rhodobacterales, class Alphaproteobacteria. The closest neighbours were Paracoccus aestuarii strain B7T (97.2% similarity), Paracoccus zeaxanthinifaciens ATCC 21588T (97.1% similarity) and Paracoccus homiensis DD-R11T (96.8%). The predominant fatty acids were C18:1 ω7c (82.1%), and significant amounts of C18:0 (5.6%), C10:0 3-OH (2.3%) and C16:0 (1.5%) were present. The predominant respiratory ubiquinone of strain JLT1284T was Q-10 and the DNA G+C content of strain JLT1284T was 67.0 mol%. The isolate was also distinguishable from members of the genus Paracoccus on the basis of phenotypic and biochemical characteristics. It is evident from the genotypic, chemotaxonomic and phenotypic data, therefore, that strain JLT1284T represents a novel species of the genus Paracoccus, for which the name Paracoccus beibuensis sp. nov. is proposed. The type strain is JLT1284T (=LMG 24871T = CGMCC 1.7295T).
KeywordsAstaxanthin Cellular Fatty Acid Isoprenoid Quinone Predominant Fatty Acid ATCC 21588T
The authors would like to thank Professor Shuang-jiang Liu, Institute of Microbiology, Chinese academy of Science and China General Microbiological Culture Collection Center for their valuable help. This work was supported by the MOST project (2007CB815900), the NSFC projects (40632013), the SOA project (200805068).
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