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Information on EC 1.11.1.24 - thioredoxin-dependent peroxiredoxin

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EC Tree
     1 Oxidoreductases
         1.11 Acting on a peroxide as acceptor
             1.11.1 Peroxidases
                1.11.1.24 thioredoxin-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. Thioredoxin-dependent peroxiredoxins are the most common. They have been reported from archaea, bacteria, fungi, plants, and animals.
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The expected taxonomic range for this enzyme is: Archaea, Eukaryota, Bacteria
Synonyms
1-Cys peroxiredoxin, 1-Cys Prx, 1-Cys type Prx, 2-Cys peroxiredoxin, 2-Cys peroxiredoxin 4, 2-Cys Prx, 2-Cys type Prx, 25 kDa thiol-specific oxidant, 2Cys-peroxiredoxin, AbTPx1, more
REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
2 R'-SH + ROOH = R'-S-S-R' + H2O + ROH
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thioredoxin + ROOH = thioredoxin disulfide + H2O + ROH
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