Crystal structure of an archaeal peroxiredoxin from the aerobic hyperthermophilic crenarchaeon Aeropyrum pernix K1

Eiichi Mizohata, Hiroaki Sakai, Emiko Fusatomi, Takaho Terada, Kazutaka Murayama, Mikako Shirouzu, Shigeyuki Yokoyama

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)


Peroxiredoxins (Prxs) are thiol-dependent peroxidases that catalyze the detoxification of various peroxide substrates such as H2O 2, peroxinitrite, and hydroperoxides, and control some signal transduction in eukaryotic cells. Prxs are found in all cellular organisms and represent an enormous superfamily. Recent genome sequencing projects and biochemical studies have identified a novel subfamily, the archaeal Prxs. Their primary sequences are similar to those of the 1-Cys Prxs, which use only one cysteine residue in catalysis, while their catalytic properties resemble those of the typical 2-Cys Prxs, which utilize two cysteine residues from adjacent monomers within a dimer in catalysis. We present here the X-ray crystal structure of an archaeal Prx from the aerobic hyperthermophilic crenarchaeon, Aeropyrum pernix K1, determined at 2.3 Å resolution (Rwork of 17.8% and Rfree of 23.0%). The overall subunit arrangement of the A. pernix archaeal Prx is a toroid-shaped pentamer of homodimers, or an (α2)5 decamer, as observed in the previously reported crystal structures of decameric Prxs. The basic folding topology and the peroxidatic active site structure are essentially the same as those of the 1-Cys Prx, hORF6, except that the C-terminal extension of the A. pernix archaeal Prx forms a unique helix with its flanking loops. The thiol group of the peroxidatic cysteine C50 is overoxidized to sulfonic acid. Notably, the resolving cysteine C213 forms the intra-monomer disulfide bond with the third cysteine, C207, which should be a unique structural characteristic in the many archaeal Prxs that retain two conserved cysteine residues in the C-terminal region. The conformational flexibility near the intra-monomer disulfide linkage might be necessary for the dramatic structural rearrangements that occur in the catalytic cycle.

Original languageEnglish
Pages (from-to)317-329
Number of pages13
JournalJournal of Molecular Biology
Issue number2
Publication statusPublished - 2005 Nov 25


  • Antioxidant enzyme
  • Cysteine sulfonic acid
  • Reactive oxygen species
  • Thioredoxin fold
  • Thioredoxin peroxidase


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