Crystal structure of a novel human peroxidase enzyme at 2.0 A resolution.
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Choi HJ, Kang SW, Yang CH, Rhee SG, Ryu SE
Crystal structure of a novel human peroxidase enzyme at 2.0 A resolution.
Nat Struct Biol. 1998 May;5(5):400-6.
- PubMed ID
- 9587003 [ View in PubMed]
- Abstract
Hydrogen peroxide (H2O2) has been implicated recently as an intracellular messenger that affects cellular processes including protein phosphorylation, transcription and apoptosis. A set of novel peroxidases, named peroxiredoxins (Prx), regulate the intracellular concentration of H2O2 by reducing it in the presence of an appropriate electron donor. The crystal structure of a human Prx enzyme, hORF6, reveals that the protein contains two discrete domains and forms a dimer. The N-terminal domain has a thioredoxin fold and the C-terminal domain is used for dimerization. The active site cysteine (Cys 47), which exists as cysteine-sulfenic acid in the crystal, is located at the bottom of a relatively narrow pocket. The positively charged environment surrounding Cys 47 accounts for the peroxidase activity of the enzyme, which contains no redox cofactors.