期刊
INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY
卷 71, 期 11, 页码 -出版社
MICROBIOLOGY SOC
DOI: 10.1099/ijsem.0.005098
关键词
Brevibacillus composti sp; nov; hyperthermophilic compost; thermophile
类别
资金
- Fujian Academy of Agricultural Sciences [AGP2018-3]
- Fujian Special Fund for Public Interest Research [2019R1034-2]
Two thermophilic bacterial strains, designated FJAT-54423T and FJAT-54424, were isolated from hyperthermophilic compost in Shanxi Province, PR China. They belong to a novel species of the genus Brevibacillus, named Brevibacillus composti, based on physiological properties, chemotaxonomic characteristics, and genetic analysis. These strains show high sequence similarity and phylogenetic relationship with Brevibacillus borstelensis.
Two aerobic, Gram- stain- positive, rod- shaped, endospore- forming, thermophilic bacterial strains, designated FJAT- 54423T and FJAT- 54424, were isolated from hyperthermophilic compost sampled in Shanxi Province, PR China. Growth was observed at 30-60 degrees C (optimum, 50 degrees C) and pH 6.0-9.0 (optimum, pH 7.0), with up to 2.0 % (w/v) NaCl (optimum, 0 % NaCl). The 16S rRNA gene sequence similarity between FJAT- 54423T and FJAT- 54424 was 99.9%, and the maximum similarity to a valid taxon was observed with Brevibacillus borstelensis (98.3%). Further, in phylogenetic and phylogenomic trees, strains FJAT- 54423T and FJAT- 54424 branched with members of the genus Brevibacillus. The menaquinone was MK- 7, and the major fatty acids were iso-C15: 0 and anteiso- C15:0. The main polar lipids included phosphatidylmethylethanolamine, phosphatidylethanolamine, diphosphatidylglycerol and phosphatidylglycerol. The cell- wall peptidoglycan was found to contain meso-diaminopimelic acid. The DNA G+C content of strains FJAT- 54423T and FJAT- 54424 were 54.3 and 54.4 mol%, respectively. The average nucleotide identity (ANI) and digital DNA-DNA hybridization (dDDH) values of strain FJAT- 54423T and its most closely related reference strain B. borstelensis DSM 6347T were 77.7 and 21.5 %, respectively, which were lower than the recommended species delineation thresholds of ANI (95%) and dDDH (70%). Based on the observed physiological properties, chemotaxonomic characteristics and ANI and dDDH values, FJAT- 54423T and FJAT- 54424 belong to a novel species of the genus Brevibacillus, for which the name Brevibacillus composti sp. nov. is proposed. The type strain is FJAT- 54423T (=GDMCC 1.2054T=KCTC 43273T).
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