一种新型厌氧异养细菌,指定菌株SWIR-1T,是从西南印度脊2700m深度处收集的深海热液喷口田样品中分离出来的。系统发育分析表明,菌株SWIR-1T属于Tepidibacter属,亲缘关系最密切的菌种是中嗜热杆菌B1T(16SrRNA基因序列相似性为99.1%),体部菌种DV1184T(94.6%)和地中海部菌种SC562T(93.9%)。菌株SWIR-1T与Tepidibacter的三种类型菌株具有77.3-87.2%的平均核苷酸同一性和21.5-35.7%的数字DNA-DNA杂交值。菌株SWIR-1T的细胞为革兰氏染色阳性,能动,短直杆。当在富含热球菌的培养基上生长时,在静止期细胞中观察到内孢子。菌株SWIR-1T在15-45°C生长(最佳,30°C),在pH5.5-8.0时(最佳,pH7.0)和1.0-6.0%(w/v)NaCl(最佳,2.0%)。菌株SWIR-1T使用的底物包括复杂的蛋白质,甲壳素,淀粉,乳糖,麦芽糖,果糖,半乳糖,葡萄糖,鼠李糖,阿拉伯糖,核糖,丙氨酸,甘氨酸和甘油。葡萄糖的主要发酵产物是乙酸盐,乳酸,H2和CO2。元素硫,硫酸盐,硫代硫酸盐,亚硫酸盐,富马酸盐,硝酸盐,亚硝酸盐和FeCl3不用作末端电子受体。主要的细胞脂肪酸由异C15:0(28.4%)组成,C15:1异F(15.4%)和C16:0(9.8%)。主要的极性脂质是磷脂和糖脂。未检测到呼吸醌。基因组比较揭示了一个独特的混合基因簇,包括hyb-tat-hyp基因,在合成中起着至关重要的作用,成熟,NiFe氢化酶的活化和输出。根据系统发育分析,基因组,生理和化学分类学特征,菌株SWIR-1T被认为是Tepidibacter属中的一种新物种,其名称为Tepidibacterhydrothermalissp.11月。是提议的。类型菌株是菌株SWIR-1T(=DSM113848T=MCCC1K07078T)。
A novel anaerobic heterotrophic bacterium, designated strain SWIR-1T, was isolated from a deep-sea hydrothermal vent field sample collected from the Southwest Indian Ridge at a depth of 2700 m. Phylogenetic analysis indicated that strain SWIR-1T belongs to the genus Tepidibacter, and the most closely related species are Tepidibacter mesophilus B1T (99.1 % 16S rRNA gene sequence similarity), Tepidibacter formicigenes DV1184T (94.6 %) and Tepidibacter thalassicus SC562T (93.9 %). Strain SWIR-1T shares 77.3-87.2 % average nucleotide identity and 21.5-35.7 % digital DNA-DNA hybridization values with the three type strains of Tepidibacter species. Cells of strain SWIR-1T were Gram-stain-positive, motile, short straight rods. Endospores were observed in stationary-phase cells when grown on Thermococcales rich medium. Strain SWIR-1T grew at 15-45 °C (optimum, 30°C), at pH 5.5-8.0 (optimum, pH 7.0) and with 1.0-6.0 % (w/v) NaCl (optimum, 2.0 %). Substrates utilized by strain SWIR-1T included complex proteinaceous, chitin, starch, lactose, maltose, fructose, galactose, glucose, rhamnose, arabinose, ribose, alanine, glycine and glycerol. The major fermentation products from glucose were acetate, lactate, H2 and CO2. Elemental sulphur, sulphate, thiosulphate, sulphite, fumarate, nitrate, nitrite and FeCl3 are not used as terminal electron acceptors. The main cellular fatty acids consisted of iso-C15 : 0 (28.4 %), C15 : 1 iso F (15.4 %) and C16 : 0 (9.8 %). The major polar lipids were phospholipids and glycolipids. No respiratory quinones were detected. Genomic comparison revealed a distinctive blended gene cluster comprising hyb-tat-hyp genes, which play a crucial role in the synthesis, maturation, activation and export of NiFe-hydrogenase. Based on the phylogenetic analysis, genomic, physiologic and chemotaxonomic characteristics, strain SWIR-1T is considered to represent a novel species within the genus Tepidibacter, for which the name Tepidibacter hydrothermalis sp. nov. is proposed. The type strain is strain SWIR-1T (=DSM 113848T=MCCC 1K07078T).