Paracoccus albicereus sp. nov., isolated from the shallow-sea hydrothermal system off Kueishantao Island.

Abstract

Strain designated TK19116T was isolated from the shallow-sea hydrothermal systems off Kueishantao Island in Taiwan, China. The bacterium was Gram-stain-negative, aerobic, oxidase-positive and catalase-positive. Cells of the strain TK19116T were short-rod-shaped and non-motile. The results of phylogenetic analysis of 16S rRNA gene sequences indicated that strain TK19116T belonged to the genus Paracoccus, with the highest sequence similarity to Paracoccus alkanivorans 4-2T (97.1 %). The average nucleotide identity values between the strain TK19116T with Paracoccus alkanivorans 4-2T, Paracoccus zhejiangensis J6T, Paracoccus siganidrum M26T and Paracoccus tegillarcae BM15T were 75.3, 76.7, 76.7 and 75.8%, respectively. The digital DNA-DNA hybridization value between the strain TK19116T with Paracoccus alkanivorans 4-2T, Paracoccus zhejiangensis J6T, Paracoccus siganidrum M26T and Paracoccus tegillarcae BM15T were 19.7, 20.3, 20.5 and 20.0%, respectively. The main respiratory quinone of strain TK19116T was ubiquinone 10. The polar lipids include aminolipid, phosphatidylcholine, diphosphatidylglycerol, glycolipid, phosphatidylglycerol and phospholipid. The principal fatty acid of strain TK19116T was summed feature 8 (C18 : 1 ω6c and/or C18 : 1 ω7c). The G+C content of the chromosomal DNA was 64.2 %. The combination of the results of the phylogenetic, phenotypic and chemotaxonomic analysis, strain TK19116T represents a novel species of the genus Paracoccus, for which the name Paracoccus albicereus sp. nov. is proposed. The type strain is TK19116T (= MCCC 1K08025T=JCM 35527T).