Frigidibacter oleivorans sp. nov., isolated from a deep well with oil reservoir water.

A Gram-stain-negative, rod-shaped bacterium, designated XJ4T, was isolated from oil-contaminated water, collected from Xinjiang Province, north-west PR China (45° 1' 27″ N, 85° 6' 14″ E). Growth occurred at 20-45 °C (optimum, 30 °C) and pH 6.0-10.0 (optimum, pH 6.0-7.0). Strain XJ4T could tolerate up to 7 % (w/v) NaCl and grow optimally in the absence of NaCl. Phylogenetic analysis based on comparative sequence analysis of 16S rRNA gene sequences indicated that strain XJ4T belonged to the genus Frigidibacter, and that was closely related to Frigidibacter mobilis cai42T (97.2 %), Frigidibacter albus SP32T (97.0 %) and Rhodobacter aestuarii JA296T (97.0 %). The average nucleotide identity values between XJ4T and three type strains were 77.9, 77.6 and 71.9 %, respectively. The DNA G+C content of strain XJ4T was 69.5 mol%. The sole respiratory quinone was Q-10. The major cellular fatty acid was summed feature 8 (C18 : 1 ω7c and/or C18 : 1 ω6c), C18 : 0 and 11-methyl C18 : 1 ω7c. The polar lipids were diphosphatidylglycerol, phosphatidylglycerol, unidentified phospholipids, an unidentified aminolipid and unidentified lipids. On the basis of phenotypic, chemotaxonomic and phylogenetic analyses, strain XJ4T represents a novel species of the genus Frigidibacter, for which the name Frigidibacter oleivorans sp. nov. is proposed. The type strain is XJ4T (=CGMCC 1.13778T=LMG 30952T).