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单词 Catechol oxidase
释义

Catechol oxidase

英语百科

Catechol oxidase

The reduced (Cu(I)-Cu(I)) and native (Cu(II)-Cu(II)) catechol oxidase di-copper active site from the Ipomoea batata crystal structure (PDB: 1BT1, 1BT2).
Proposed catalytic cycle of catechol oxidase purified from Ipomoea batata.

Catechol oxidase is a copper oxidase that contains a type 3 di-copper cofactor and catalyzes the oxidation of ortho-diphenols into ortho-quinones coupled with the reduction of molecular oxygen to water. It is present in a variety of species of plants and fungi including Ipomoea batatas (sweet potato) and Camellia sinensis (Indian tea leaf). Metalloenzymes with type 3 copper centers are characterized by their ability to reversibly bind dioxygen at ambient conditions. In plants, catechol oxidase plays a key role in enzymatic browning by catalyzing the oxidation of catechol to o-quinone in the presence of oxygen, which can rapidly polymerize to form the melanin that grants damaged fruits their dark brown coloration.

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