1887

Abstract

A thermophilic, filamentous, heterotrophic bacterium, designated strain JAD2, a member of an as-yet uncultivated lineage that is present and sometimes abundant in some hot springs worldwide, was isolated from sediment of Great Boiling Spring in Nevada, USA. Cells had a mean diameter of 0.3 µm and length of 4.0 µm, and formed filaments that typically ranged in length from 20 to 200 µm. Filaments were negative for the Gram stain reaction, spores were not formed and motility was not observed. The optimum temperature for growth was 72.5–75 °C, with a range of 67.5–75 °C, and the optimum pH for growth was 6.75, with a range of pH 6.5–7.75. Peptone, tryptone or yeast extract were able to support growth when supplemented with vitamins, but no growth was observed using a variety of defined organic substrates. Strain JAD2 was microaerophilic and facultatively anaerobic, with optimal growth at 1 % (v/v) O and an upper limit of 8 % O. The major cellular fatty acids (>5 %) were C, C, C, C and C. The genomic DNA G+C content was 69.3 mol%. Phylogenetic and phylogenomic analyses using sequences of the 16S rRNA gene and other conserved genes placed JAD2 within the phylum , but not within any existing class in this phylum. These results indicate that strain JAD2 is the first cultivated representative of a novel lineage within the phylum , for which we propose the name gen. nov., sp. nov., within classis nov., ord. nov. and fam. nov. The type strain of is JAD2 ( = JCM 19131 = CCTCC AB-2014030).

Funding
This study was supported by the:
  • National Science Foundation (Award OISE 0968421 and MCB-0546865)
  • NASA (Award EXO-NNX11AR78G)
  • Joint Genome Institute (Award CSP-237)
  • Office of Science of the Department of Energy (Award DE-AC02-05CH11231)
  • Amazon Web Services (Award EDU_Hedlund_UNLVResearch_Summer2012)
  • National Basic Research Program of China (Award 2010CB833801)
  • National Natural Science Foundation of China (Award 31070007)
  • Key Project of International Cooperation of China Ministry of Science and Technology (Award MOST #2013DFA31980)
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2014-06-01
2024-03-28
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