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A Gram-stain-positive, solvent-tolerating, aerobic, rod-shaped bacterium that formed terminal endospores was isolated from the organic solvent acetophenone. The strain, designated JC23T, was oxidase- and catalase-positive. The strain grew in the presence of a wide range of organic solvents with partition coefficients (log p values) between 1 and 4, which are exceptionally toxic to micro-organisms. Based on 16S rRNA gene sequence analysis, strain JC23T was identified as belonging to the genus Lysinibacillus and was most closely related to Lysinibacillus manganicus Mn1-7T (98.5 % similarity), L. massiliensis 440831T (97.2 %) and L. chungkukjangi 2RL3-2T (96.8 %). DNA-DNA relatedness of strain JC23T with the type strains of the closest species was &lt;39 %. Strain JC23T grew chemo-organoheterotrophically with optimal growth at pH 7 (range pH 6-9) and at 35 °C (range 25-40 °C). The DNA G+C content was 41 mol%. Major cellular fatty acids of strain JC23T were iso-C15 : 0, iso-C16 : 0, anteiso-C15 : 0 and anteiso-C17 : 0. The cell-wall peptidoglycan type was determined to be A4α (l-Lys-d-Asp), which is in agreement with the cell-wall characteristics of the genus Lysinibacillus. The predominant quinone system was MK-7. Polar lipids of strain JC23T included diphosphatidylglycerol, phosphatidylglycerol, two unidentified glycolipids, β-gentiobiosyldiacylglycerol, two unidentified phospholipids and two unidentified lipids. On the basis of our morphological, physiological, genetic, phylogenetic and chemotaxonomic analyses, we conclude that strain JC23T should be assigned to a novel species of the genus Lysinibacillus, for which the name Lysinibacillus acetophenoni sp. nov. is proposed. The type strain is strain JC23T ( = CCUG 57911T = KCTC 13605T = NBRC 105754T = DSM 23394T).

Lysinibacillus acetophenoni sp. nov., a solvent-tolerant bacterium isolated from acetophenone