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Description of Sinobacter flavus gen. nov., sp. nov., and proposal of Sinobacteraceae fam. nov.

¹ Key Laboratory of Microbiological Engineering of Agricultural Environment, Ministry of Agriculture, Life Sciences College of Nanjing Agricultural University, Nanjing, Jiangsu 210095, PR China
² The Key Laboratory for Microbial Resources of the Ministry of Education, PR China, and Laboratory for Conservation and Utilization of Bio-Resources, Yunnan Institute of Microbiology, Yunnan University, Kunming, 650091, PR China
³ Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, PR China
⁴ Biotoxin department of Key Laboratory of Animal Models and Human Disease Mechanisms, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan 650223, PR China

Correspondence
Wen-Jun Li
wjli{at}ynu.edu.cn
Ren Lai
rlai72{at}njau.edu.cn

A novel Gram-negative, non-motile, rod-shaped bacterium, designated CW-KD 4^T, was isolated from a polluted soil sample collected from Jiangsu Province, China, by using a classic enrichment method. Based on 16S rRNA gene sequence analysis, the novel strain represented a deep-rooting lineage within the class Gammaproteobacteria that was clustered with the genera Hydrocarboniphaga and Nevskia and some other unidentified bacteria. Polyphasic taxonomic studies revealed that strain CW-KD 4^T showed rather distant relationships to its phylogenetically closest neighbours, including the two recognized genera Hydrocarboniphaga and Nevskia. Strain CW-KD 4^T showed only 89.9 % and 89.7 % 16S rRNA gene sequence similarities to the type species of the genera Hydrocarboniphaga and Nevskia, respectively. The predominant isoprenoid quinone of strain CW-KD 4^T was Q-8 with minor components including Q-9, MK-7 and MK-6. The major fatty acids were C_{16 : 0}, C_{18 : 1}7c and summed feature 3. The G+C content of the DNA was 65.1 mol%. On the basis of its distinctive phenotypic and genotypic characteristics, strain CW-KD 4^T represents a new genus and a novel species in the class Gammaproteobacteria, for which the name Sinobacter flavus gen. nov., sp. nov. is proposed. The type strain is CW-KD 4^T (=DSM 18980^T=KCTC 12881^T=CCTCC AB 206145^T). In addition, a new family, Sinobacteraceae fam. nov., is proposed to house the genus Sinobacter gen. nov.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain CW-KD 4^T is EF154515.

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