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A yellow-pigmented bacterial strain, designated 9NM-10T, was isolated from an abandoned lead-zinc mine in Meizhou, Guangdong Province, China. Cells were strictly aerobic, Gram-stain-negative and motile with a polar monotrichous flagellum. Phylogenetic analyses based on 16S rRNA gene sequences revealed that strain 9NM-10T belongs to the genus Sphingomonas and was most closely related to Sphingomonas yantingensis JCM 19201T and Sphingomonas japonica JCM 15438T. DNA-DNA relatedness values between strain 9NM-10T and these two type strains were 43.6±1.3 and 35.4±0.9 %, respectively. It contained Q-10 as the predominant respiratory quinone and the major cellular fatty acids were C18 : 1ω7c, C16 : 0, C17 : 1ω6c and summed feature 3 (C16 : 1ω7c and/or C16 : 1ω6c). The genomic DNA G+C content of strain 9NM-10T was 68.7±0.2 mol%. The polar lipids were sphingoglycolipid, phosphatidylglycerol, phosphatidylcholine, phosphatidylethanolamine, diphosphatidylglycerol, an unidentified phospholipid and three unidentified lipids. Strain 9NM-10T contained spermidine as the major polyamine. On the basis of phenotypic, phylogenetic and chemotaxonomic analyses, strain 9NM-10T is considered to represent a novel species of the genus Sphingomonas, for which the name Sphingomonas spermidinifaciens sp. nov. is proposed. The type strain is 9NM-10T (=GDMCC 1.657T=DSM 27571T). Descriptions of the genus of Sphingomonas and the species Sphingomonas yantingensis and Sphingomonas japonica were also emended in this study.

international journal of systematic and evolutionary microbiology

Sphingomonas spermidinifaciens sp. nov., a novel bacterium containing spermidine as the major polyamine, isolated from an abandoned lead–zinc mine and emended descriptions of the genus Sphingomonas and the species Sphingomonas yantingensis and Sphingomonas japonica