Thermus sediminis sp. nov., a thiosulfate-oxidizing and arsenate-reducing organism isolated from Little Hot Creek in the Long Valley Caldera, California

En Min Zhou, Wen Dong Xian, Chrisabelle C. Mefferd, Scott C. Thomas, Arinola L. Adegboruwa, Nathan Williams, Senthil K. Murugapiran, Jeremy A. Dodsworth, Rakesh Ganji, Meng Meng Li, Yi Ping Ding, Lan Liu, Tanja Woyke, Wen Jun Li, Brian P. Hedlund

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6 Scopus citations

Abstract

Thermus species are widespread in natural and artificial thermal environments. Two new yellow-pigmented strains, L198T and L423, isolated from Little Hot Creek, a geothermal spring in eastern California, were identified as novel organisms belonging to the genus Thermus. Cells are Gram-negative, rod-shaped, and non-motile. Growth was observed at temperatures from 45 to 75 °C and at salinities of 0–2.0% added NaCl. Both strains grow heterotrophically or chemolithotrophically by oxidation of thiosulfate to sulfate. L198T and L423 grow by aerobic respiration or anaerobic respiration with arsenate as the terminal electron acceptor. Values for 16S rRNA gene identity (≤ 97.01%), digital DNA–DNA hybridization (≤ 32.7%), OrthoANI (≤ 87.5%), and genome-to-genome distance (0.13) values to all Thermus genomes were less than established criteria for microbial species. The predominant respiratory quinone was menaquinone-8 and the major cellular fatty acids were iso-C15:0, iso-C17:0 and anteiso-C15:0. One unidentified phospholipid (PL1) and one unidentified glycolipid (GL1) dominated the polar lipid pattern. The new strains could be differentiated from related taxa by β-galactosidase and β-glucosidase activity and the presence of hydroxy fatty acids. Based on phylogenetic, genomic, phenotypic, and chemotaxonomic evidence, the novel species Thermus sediminis sp. nov. is proposed, with the type strain L198T (= CGMCC 1.13590T = KCTC XXX).

Original languageEnglish (US)
Pages (from-to)983-991
Number of pages9
JournalExtremophiles
Volume22
Issue number6
DOIs
StatePublished - Nov 1 2018

Keywords

  • Genome sequencing
  • Geothermal springs
  • Little Hot Creek
  • Polyphasic taxonomy
  • Thermophile
  • Thermus sediminis sp. nov

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