The third cupredoxin domain of CumA like multicopper oxidase
This multicopper oxidase (MCO) subfamily includes CumA from Pseudomonas putida, which is involved in the oxidation of Mn(II). However, the cumA gene has been identified in a variety of bacterial species, including both Mn(II)-oxidizing and non-Mn(II)-oxidizing strains. Thus, the proteins in this family may catalyze the oxidation of other substrates. MCO catalyzes the oxidation of a variety aromatic - notably phenolic and inorganic substances coupled to the reduction of molecular oxygen to water and has been implicated in a wide spectrum of biological activities and, in particular, plays a key role in morphogenesis, development and lignin metabolism. Although MCOs have diverse functions, majority of them have three cupredoxin domain repeats that include one mononuclear and one trinuclear copper center. 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.
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