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Information on EC 1.11.1.27 - glutathione-dependent peroxiredoxin

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EC Tree
     1 Oxidoreductases
         1.11 Acting on a peroxide as acceptor
             1.11.1 Peroxidases
                1.11.1.27 glutathione-dependent peroxiredoxin
IUBMB Comments
Peroxiredoxins (Prxs) are a ubiquitous family of antioxidant proteins. They can be divided into three classes: typical 2-Cys, atypical 2-Cys and 1-Cys peroxiredoxins . The peroxidase reaction comprises two steps centred around a redox-active cysteine called the peroxidatic cysteine. All three peroxiredoxin classes have the first step in common, in which the peroxidatic cysteine attacks the peroxide substrate and is oxidized to S-hydroxycysteine (a sulfenic acid) (see {single/111115a::mechanism}). The second step of the peroxidase reaction, the regeneration of cysteine from S-hydroxycysteine, distinguishes the three peroxiredoxin classes. For typical 2-Cys Prxs, in the second step, the peroxidatic S-hydroxycysteine from one subunit is attacked by the 'resolving' cysteine located in the C-terminus of the second subunit, to form an intersubunit disulfide bond, which is then reduced by one of several cell-specific thiol-containing reductants completing the catalytic cycle. In the atypical 2-Cys Prxs, both the peroxidatic cysteine and its resolving cysteine are in the same polypeptide, so their reaction forms an intrachain disulfide bond. The 1-Cys Prxs conserve only the peroxidatic cysteine, so its regeneration involves direct interaction with a reductant molecule. Glutathione-dependent peroxiredoxins have been reported from bacteria and animals, and appear to be 1-Cys enzymes. The mechanism for the mammalian PRDX6 enzyme involves heterodimerization of the enzyme with pi-glutathione S-transferase, followed by glutathionylation of the oxidized cysteine residue. Subsequent dissociation of the heterodimer yields glutathionylated peroxiredoxin, which is restored to the active form via spontaneous reduction by a second glutathione molecule.
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Word Map
The expected taxonomic range for this enzyme is: Eukaryota, Bacteria
Synonyms
1-Cys peroxiredoxin, 1-Cys Prdx, 1-Cys Prx, 1-CysPrx, 2-Cys peroxiredoxin, 2-Cys peroxiredoxin TPx-1, HI0572, peroxiredoxin 6, peroxiredoxin II, peroxiredoxin VI, more
REACTION
REACTION DIAGRAM
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ORGANISM
UNIPROT
LITERATURE
2 glutathione + ROOH = glutathione disulfide + H2O + ROH
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