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A new class EC 7, Translocases, has been added to the EC list. It will be part of ENZYME from release 2018_10. Read more about EC 7 here.

ENZYME entry: EC

Accepted Name
Alternative Name(s)
Peroxiredoxin-(S-hydroxy-S-oxocysteine) reductase.
Reaction catalysed
Peroxiredoxin-(S-hydroxy-S-oxocysteine) + ATP + 2 R-SH <=> peroxiredoxin-(S-hydroxycysteine) + ADP + phosphate + R-S-S-R
  • In the course of the reaction of EC, its cysteine residue is alternately oxidized to the sulfenic acid, S-hydroxycysteine, and reduced back to cysteine.
  • Occasionally the S-hydroxycysteine residue is further oxidized to the sulfinic acid S-hydroxy-S-oxocysteine, thereby inactivating the enzyme.
  • The reductase provides a mechanism for regenerating the active form of peroxiredoxin, i.e. the peroxiredoxin-(S-hydroxycysteine) form.
  • Apparently the reductase first catalyzes the phosphorylation of the -S(O)-OH group by ATP to give -S(O)-O-P, which is attached to the peroxiredoxin by a cysteine residue, forming an -S(O)-S- link between the two enzymes.
  • Attack by a thiol splits this bond, leaving the peroxiredoxin as the sulfenic acid and the reductase as the thiol.
PRIAM enzyme-specific profiles1.8.98.2
KEGG Ligand Database for Enzyme Nomenclature1.8.98.2
IUBMB Enzyme Nomenclature1.8.98.2
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