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INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY logo International Journal of Systematic and Evolutionary Microbiology

Volume 67, Issue 6

sp. nov., a novel anaerobic hyperthermophilic archaeon that reduces thiosulfate and ferric iron Free

Abstract

A novel anaerobic, hyperthermophilic archaeon was isolated from a mud volcano in the Salton Sea geothermal system in southern California, USA. The isolate, named strain 521, grew optimally at 90 °C, at pH 5.5–7.3 and with 0–2.0 % (w/v) NaCl, with a generation time of 10 h under optimal conditions. Cells were rod-shaped and non-motile, ranging from 2 to 7 µm in length. Strain 521 grew only in the presence of thiosulfate and/or Fe(III) (ferrihydrite) as terminal electron acceptors under strictly anaerobic conditions, and preferred protein-rich compounds as energy sources, although the isolate was capable of chemolithoautotrophic growth. 16S rRNA gene sequence analysis places this isolate within the crenarchaeal genus . To our knowledge, this is the first strain to be isolated from an anaerobic mud volcano and to reduce only either thiosulfate or ferric iron. An genome-to-genome distance calculator reported <25 % DNA–DNA hybridization between strain 521 and eight other species. Due to its genotypic and phenotypic differences, we conclude that strain 521 represents a novel species, for which the name sp. nov. is proposed. The type strain is 521 (=DSM 103086=ATCC TSD-56).

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): Fe(III) respiration , hyperthermophile , mud volcano , Pyrobaculum and thiosulfate
© 2017 IUMS
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2017-06-01
2025-05-22
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Pyrobaculum igneiluti sp. nov., a novel anaerobic hyperthermophilic archaeon that reduces thiosulfate and ferric iron
Int J Syst Evol Microbiol 67, 1714 (2017); https://doi.org/10.1099/ijsem.0.001850
/content/journal/ijsem/10.1099/ijsem.0.001850
/content/journal/ijsem/10.1099/ijsem.0.001850
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