1887

Abstract

Two Gram-positive, rod-shaped, endospore-forming strains, YIM B05601 and YIM B05602, were isolated from soil sampled at Hamazui hot spring, Tengchong City, Yunnan Province, PR China. Phylogenetic analysis based on 16S rRNA gene sequences suggested that the two strains fell within the genus , appearing most closely related to YIM B00362 (96.9 % sequence similarity). Genome-based phylogenetic analysis confirmed that strains YIM B05601 and YIM B05602 formed a distinct phylogenetic cluster within the genus . The average nucleotide identity (ANI) and digital DNA–DNA hybridization (dDDH) values of strains YIM B05601 and YIM B05602 with the related species YIM B00362 were within the ranges of 74.43–74.57 % and 12.1–18.5 %, respectively, which clearly indicated that strains YIM B05601, YIM B05602 represented a novel species. Strains YIM B05601 and YIM B05602 exhibited 99.6 % 16S rRNA gene sequence similarity. The ANI and dDDH values between the two strains were 99.8 and 100 %, respectively, suggesting that they belong to the same species. Optimum growth for both strains occurred at pH 7.0 and 45 °C. The diagnostic diamino acid in the cell-wall peptidoglycan of strains YIM B05601 and YIM B05602 was -diaminopimelic acid. MK-7 was the predominant menaquinone. The polar lipids of strain YIM B05602 were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, phosphatidylmonomethylethanolamine, four unidentified glycolipids, an unidentified polarlipid and phosphatidylinositol mannoside. The major fatty acids of the two stains were iso-C and anteiso-C. Based on phylogenomic and phylogenetic analyses coupled with phenotypic and chemotaxonomic characterizations, strains YIM B05601 and YIM B05602 could be classified as a novel species of the genus , for which the name sp. nov. is proposed. The type strain is YIM B05602 (=CGMCC 1.60051=KCTC 43460=NBRC 115924).

Funding
This study was supported by the:
  • the Natural Science Foundation of Anhui Province Department of Education (Award KJ2020A0058)
    • Principle Award Recipient: Yong-MeiMiao
  • National Natural Science Foundation of China (Award 31860017)
    • Principle Award Recipient: MinYin
  • National Natural Science Foundation of China (Award 82160674)
    • Principle Award Recipient: MinYin
  • National Natural Science Foundation of China (Award 31760003)
    • Principle Award Recipient: Shu-KunTang
  • Major Science and Technology Projects of Yunnan Province (Award 202002AA100007)
    • Principle Award Recipient: Shu-KunTang
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2024-04-12
2024-04-29
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