Ottowia flava sp. nov., isolated from fish intestines

A novel Gram-negative bacterium, non-motile and short rod-shaped, designated strain GY511^T, was isolated from the intestines of fish collected from Maowei Sea, China. Growth occurred at pH 6.0-9.0 (optimum 7.0), 4-37 °C (optimum 28 °C) and at 0-2.5% (w/v) NaCl (optimum 1.0%). The result of 16S rRNA gene sequence analysis showed that strain GY511^T is closely related to O. oryzae NBRC 113109^T (97.6%), O. konkukae DSM 105395^T (97.4%), Ottowia beijingensis CGMCC 1.12324^T (95.9%), Ottowia pentelensis DSM 21699^T (95.2%) and Ottowia thiooxydans DSM 14619^T (95.0%). The DNA-DNA hybridization values of strain GY511^T with O. oryzae NBRC 113109^T and O. konkukae DSM 105395^T were 35.4 ± 3.1% and 26.3 ± 1.8%, respectively. The major fatty acids (> 10%) were identified as summed feature 3 (C_16:1ω7c and/or C_16:1ω6c), C_16:0 and summed feature 8 (C_18:1ω7c and/or C_18:1ω6c) and the major respiratory quinone was ubiquinone-8 (Q-8). The polar lipids comprised diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, phosphatidylmethylethanolamine, two unidentified aminolipids and an unidentified phospholipid. The G+C content of the genomic DNA was 62.9 mol%. Thiosulfate could be utilized as co-substrate for aerobic growth and was oxidised to sulfate. On the basis of phenotypic, chemotaxonomic and molecular data, strain GY511^T is considered to represent a novel species of the genus Ottowia, for which the name Ottowia flava sp. nov. is proposed. The type strain is GY511^T (= NBRC 113500^T = DSM 107425^T = CGMCC 1.13650^T).