Cupredoxin domain 3 of laccase-like multicopper oxidases; including laccase, CueO, spore coat protein A, ascorbate oxidase and similar proteins
Laccase-like multicopper oxidases (MCOs) in this family contain three cupredoxin domains. They are able to couple oxidation of substrates with reduction of dioxygen to water. MCOs are capable of oxidizing a vast range of substrates, varying from aromatic to inorganic compounds such as metals. Although the members of this family have diverse functions, majority of them have three cupredoxin domain repeats. The copper ions are bound in several sites; Type 1, Type 2, and/or Type 3. The ensemble of types 2 and 3 copper is called a trinuclear cluster. MCOs oxidize their substrate by accepting electrons at a mononuclear copper center and transferring them to the active site trinuclear copper center. The cupredoxin domain 3 of 3-domain MCOs contains the Type 1 (T1) copper binding site and part the trinuclear copper binding site, which is located at the interface of domains 1 and 3. Also included in this family are cupredoxin domains 2, 4, and 6 of the 6-domain MCO ceruloplasmin and similar proteins.
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