Extremophiles

, Volume 16, Issue 2, pp 245–253

Thermotomaculum hydrothermale gen. nov., sp. nov., a novel heterotrophic thermophile within the phylum Acidobacteria from a deep-sea hydrothermal vent chimney in the Southern Okinawa Trough

  • Hiroshi Izumi
  • Takuro Nunoura
  • Masayuki Miyazaki
  • Sayaka Mino
  • Tomohiro Toki
  • Ken Takai
  • Yoshihiko Sako
  • Tomoo Sawabe
  • Satoshi Nakagawa
Original Paper

DOI: 10.1007/s00792-011-0425-9

Cite this article as:
Izumi, H., Nunoura, T., Miyazaki, M. et al. Extremophiles (2012) 16: 245. doi:10.1007/s00792-011-0425-9

Abstract

A novel heterotrophic, thermophilic bacterium, designated strain AC55T, was isolated from a deep-sea hydrothermal vent chimney at the Hatoma Knoll in the Okinawa Trough, Japan. Cells of strain AC55T were non-motile, long rods (2.0- to 6.8-μm long and 0.3- to 0.6-μm wide). The strain was an obligatory anaerobic heterotroph capable of fermentative growth on complex proteinaceous substances. Elemental sulfur was reduced to hydrogen sulfide but did not stimulate growth. Growth was observed between 37 and 60°C (optimum 55°C), pH 5.5 and 8.5 (optimum pH 6.6), and in the presence of 1.5–4.5% (w/v) NaCl (optimum 2.5%, w/v). Menaquinone-7 and -8 were the major respiratory quinones. The G + C content of the genomic DNA from strain AC55T was 51.6 mol%. The 16S rRNA gene sequence analysis revealed that strain AC55T was the first cultivated representative of Acidobacteria subdivision 10. Based on the physiological and phylogenetic features of the novel isolate, the genus name Thermotomaculum gen. nov. is proposed, with Thermotomaculum hydrothermale sp. nov. as the type species. The type strain is AC55T (=JCM 17643T = DSM 24660T = NBRC 107904T).

Keywords

AcidobacteriaDeep-sea hydrothermal ventThermophileFermentation

Supplementary material

792_2011_425_MOESM1_ESM.docx (1.2 mb)
Supplementary material 1 (DOCX 1205 kb)

Copyright information

© Springer 2011

Authors and Affiliations

  • Hiroshi Izumi
    • 1
  • Takuro Nunoura
    • 2
  • Masayuki Miyazaki
    • 2
  • Sayaka Mino
    • 1
  • Tomohiro Toki
    • 3
  • Ken Takai
    • 2
  • Yoshihiko Sako
    • 4
  • Tomoo Sawabe
    • 1
  • Satoshi Nakagawa
    • 1
    • 2
  1. 1.Laboratory of Microbiology, Faculty of Fisheries SciencesHokkaido UniversityHakodateJapan
  2. 2.Subsurface Geobiology Advanced Research (SUGAR) Project, Institute of BiogeosciencesJapan Agency for Marine-Earth Science and Technology (JAMSTEC)YokosukaJapan
  3. 3.Faculty of ScienceUniversity of the RyukyusNishiharaJapan
  4. 4.Laboratory of Marine Microbiology, Division of Applied Biosciences, Graduate School of AgricultureKyoto UniversityKyotoJapan