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Pseudoalteromonas lipolytica sp. nov., isolated from the Yangtze River Estuary Near the East China Sea

¹ Second Institute of Oceanography, State Oceanic Administration;
² College of Life Sciences, Zhejiang University

³ E-mail: xuxw{at}sio.org.cn

A strictly aerobic, Gram-negative, non-pigmented bacterial strain, designated LMEB 39^T, was isolated from a seawater sample collected from the Yangtze River estuary near the East China Sea and was examined physiologically, chemotaxonomically and phylogenetically. The novel isolate was motile by a single polar flagellum, positive for nitrate reduction and casein, gelatin, Tween 20 and Tween 80 decomposition and negative for indole production. Chemotaxonomic analysis showed ubiquinone-8 as predominant respiratory quinone and phosphatidylethanolamine and phosphatidylglycerol as major polar lipids. The major fatty acids were C_16:17c/iso-C_15:0 2OH, C_16:0, C_18:17c, C_12:0 3OH, C_17:18c and C_17:0. The genomic DNA G + C content was 42.3 mol%. Comparative 16S rRNA gene sequence analysis revealed that the isolate belongs to the genus Pseudoalteromonas. Strain LMEB 39^T exhibited the closest phylogenetic affinity to Pseudoalteromonas byunsanensis JCM 12483^T (97.4 % sequence similarity). The DNA-DNA reassociation values between strain LMEB 39^T and P. byunsanensis JCM 12483^T and Pseudoalteromonas undina DSM 6065^T (97.2 % sequence similarity) were 31.7 and 30.3 %, respectively. On the basis of phenotypic and genotypic data, strain LMEB 39^T represents a novel species of the genus Pseudoalteromonas, for which the name Pseudoalteromonas lipolytica sp. nov. (type strain LMEB 39^T = CGMCC 1.8499^T = JCM 15903^T) is proposed.