Meiothermus luteus sp nov., a slightly thermophilic bacterium isolated from a hot spring

A slightly thermophilic, aerobic bacterium, designated YIM 72257(T), was isolated from a sediment sample taken from a hot spring in Tengchong county, Yunnan province, south-west China. The isolate was Gram-stain-negative, non-sporulating and forms non-motile rods, appearing in chains. The isolate grew at 50-65 degrees C, pH 6.0-9.0 and with 0.5-1% NaCl (w/v). 16S rRNA gene sequence analysis showed that strain YIM 72257(T) was most closely related to Meiothermus cateniformans LY1(T) (95.6 %), Meiothermus ruber DSM 1279 T (95.1 %) and Meiothermus taiwanensis WR-30(T) (94.6 %). The genomic DNA G+C content of strain YIM 72257(T) was 62.6 mol%. The main cellular fatty acids (> 5 %) were anteiso-C-15:0, anteiso-C-17:0, iso-C-16:0, iso-C-17:0, iso-C-15:0 and C-16:0. The polar lipids consisted of an uncharacterized phospholipid and two glycolipids. Based on phenotypic, phylogenetic and chemotaxonomic characteristics, strain YIM 72257(T) is proposed to be a representative of a novel species of the genus Meiothermus, for which the name Meiothermus luteus sp. nov. is proposed. The type strain is YIM 72257(T) (= KCTC 52599(T) = CCTCC AB 2017100(T)).