A Gram-positive, thermophilic, strictly aerobic bacterium, designated WP-1T, was isolated from a sediment sample from a hot spring in Fujian province of China and subjected to a polyphasic taxonomic study. Cells of strain WP-1T were rods (~0.6–0.8 × 2.5–3.5 μm) and motile by means of peritrichous flagella. Endospores were ellipsoidal in terminal or subterminal positions. Strain WP-1T grew at 37–60 °C (optimum 42–45 °C), 0–3 % NaCl (optimum 1 %, w/v) and pH 3.0–9.0 (optimum pH 6.5–7.0). The predominant menaquinone was MK-7. The major fatty acids were anteiso-C15:0, iso-C16:0, C16:0 and anteiso-C17:0. The polar lipids consisted of diphosphatidylglycerol, phosphatidylglycerol, two glycolipids, two unidentified phospholipids and two unknown polar lipids. The cell-wall peptidoglycan contained meso-diaminopimelic acid (meso-DAP). The G + C content of the genomic DNA was 52.5 %. Phylogenetic analysis based on the 16S rRNA gene sequence showed that strain WP-1T is a member of the genus Paenibacillus and exhibited sequence similarity of 99.3 % to Paenibacillus macerans DSM 24T and both strains represented a separate lineage from all other Paenibacillus species. However, the level of DNA–DNA relatedness between strain WP-1T and P. macerans DSM 24T was 34.0 ± 4.7 %. On the basis of phylogenetic, physiological and chemotaxonomic analysis data, strain WP-1T is considered to represent as a novel species of the genus Paenibacillus, for which the name Paenibacillus thermophilus sp. nov., is proposed, with the type strain WP-1T (=DSM 24746T = JCM 17693T = CCTCC AB 2011115T).
Yu Zhou, Sheng Gao, Da-Qiao Wei, Ling-Ling Yang, Xing Huang, Jie He, Yun-Jiao Zhang, Shu-Kun Tang, Wen-Jun Li
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