Lysinibacillus acetophenoni sp. nov., a solventtolerant bacterium isolated from acetophenone

Abstract

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 ,39 %. Strain JC23T grew chemo-organoheterotrophically with optimal growth at pH 7 (range pH 6–9) and at 35oC (range 25–40oC). 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 cellwall 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).