Abstract

A Gram-positive, endospore-forming, rod-shaped bacterium, designated strain N2-5T, was isolated from swinery waste collected in Jeju, Republic of Korea. A phylogenetic analysis based on 16S rRNA gene sequences demonstrated that strain N2-5T formed a phyletic group within the phylum Firmicutes with less than 97.0% similarities to members of the genus Lysinibacillus, its nearest phylogenetic neighbors. The highest levels of sequence similarity to the isolate were observed against Lysinibacillus xylanilyticus XDB9T (96.8%), Lysinibacillus macroides LMG 18474T (95.6%), and Lysinibacillus parviboronicapiens BAM-582 T (95.6%). The organism grew optimally at 30°C and pH 7 and in the presence of 1–3% (w/v) NaCl. Strain N2-5T was chemotaxonomically characterized by possessing menaquinone-7 (MK-7) as the major menaquinone, and iso-C15:0 (54.9%), iso-C17:1ω10c (12.0%), and C16:1ω7c alcohol (11.8%) as the predominant fatty acids. The genomic DNA G+C content of the novel strain was 43.3 mol% and the cell-wall peptidoglycan was type A4α. The major polar lipids were diphosphatidylglycerol, phosphatidylglycerol, and phosphatidylethanolamine. Based on its phenotypic properties and phylogenetic data, strain N2-5T (=DSM 28310T =KCTC13837 T) represents a novel species in the genus Lysinibacillus, for which the name Lysinibacillus jejuensis sp. nov. is proposed.

• Keywords: Firmicutes; Lysinibacillus jejuensis sp. nov.; swinery waste