Iron Redox Transformation by the Thermo-Acidophilic Archaea from the Genus Sulfolobus

Yusei Masaki, Katsutoshi Tsutsumi, Naoko Okibe

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Iron redox transformations by five representative Sulfolobus strains (S. metallicus Kra23, S. tokodaii 7, S. acidocaldarius 98-3, S. solfataricus P1, S. shibatae B12) were studied to clarify the general trend of Fe metabolism across different species of the genus Sulfolobus. Negligible to major Fe(II) oxidation was detected in cell suspensions of the strains. Fe(III)-reducing ability was differently expressed in each strain with dependence on the oxygen level and growth status; growth-uncoupled cell suspensions of all strains reduced Fe(III) under either anaerobic or microaerobic conditions, or under both conditions. A linear correlation between cell growth and Fe(III) reduction was also found in S. tokodaii 7, S. solfataricus P1, and S. shibatae B12. In addition to Fe redox behaviors, the strains were also tested for reduction of highly toxic Cr(VI) to less toxic and soluble Cr(III), as an application possibility; the trend in degree of Cr(V) reduction did not necessarily correspond to that of Fe(III) reduction, suggesting the involvement of different reduction mechanisms.

Original languageEnglish
Pages (from-to)757-767
Number of pages11
JournalGeomicrobiology Journal
Issue number9
Publication statusPublished - Oct 21 2018

All Science Journal Classification (ASJC) codes

  • Microbiology
  • Environmental Chemistry
  • General Environmental Science
  • Earth and Planetary Sciences (miscellaneous)


Dive into the research topics of 'Iron Redox Transformation by the Thermo-Acidophilic Archaea from the Genus Sulfolobus'. Together they form a unique fingerprint.

Cite this