Rhodothermus obamensis sp. nov., a modern lineage of extremely thermophilic marine bacteria

Int J Syst Bacteriol. 1996 Oct;46(4):1099-104. doi: 10.1099/00207713-46-4-1099.


A novel extremely thermophilic bacterium was isolated from a shallow marine hydrothermal vent environment (depth, 22 m) in Tachibana Bay, Nagasaki Prefecture, Japan. The cells of this organism were gram-negative rods. Growth occurred at temperatures between 50 and 85 degrees C (optimum temperature, 80 degrees C; doubling time at optimum temperature, 90 min), at pH 5.5 and 9.0 (optimum pH, 7.0), and in the presence of 1 and 5% NaCl (optimum NaCl concentration, 3%). The new isolate was an aerobic heterotroph which utilized the following compounds as sole energy and carbon sources: yeast extract, peptone, starch, casein, Casamino Acids, a variety of sugars, some carboxylic acids, and amino acids. As determined by a sequence analysis of the 16S rRNA, the new isolate belongs to the genus Rhodothermus and represents a modern lineage of extreme thermophiles within the domain Bacteria. On the basis of the physiological and molecular properties of the new isolate, we describe a new species, Rhodothermus obamensis. The type strain of R. obamensis is strain OKD7 (= JCM 9785).

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Base Sequence
  • Fatty Acids / analysis
  • Gram-Negative Aerobic Bacteria / classification*
  • Gram-Negative Aerobic Bacteria / isolation & purification
  • Hydrogen-Ion Concentration
  • Molecular Sequence Data
  • Quinones / analysis
  • Temperature
  • Water Microbiology*


  • Fatty Acids
  • Quinones

Associated data

  • GENBANK/V00348
  • GENBANK/X03235
  • GENBANK/X07998
  • GENBANK/X57309
  • GENBANK/X59559
  • GENBANK/X80994
  • GENBANK/X95071