Aminocyclopropanecarboxylate oxidase

In enzymology, an aminocyclopropanecarboxylate oxidase (EC number|1.14.17.4) is an enzyme that catalyzes the chemical reaction

:1-aminocyclopropane-1-carboxylate + ascorbate + O₂ $ightleftharpoons$ ethylene + cyanide + dehydroascorbate + CO₂ + 2 H₂O

The 3 substrates of this enzyme are 1-aminocyclopropane-1-carboxylate, ascorbate, and O₂, whereas its 5 products are ethylene, cyanide, dehydroascorbate, CO₂, and H₂O.

This enzyme belongs to the family of oxidoreductases, specifically those acting on paired donors, with O2 as oxidant and incorporation or reduction of oxygen. The oxygen incorporated need not be derived from O2 with reduced ascorbate as one donor, and incorporation of one ato of oxygen into the other donor. The systematic name of this enzyme class is 1-aminocyclopropane-1-carboxylate oxygenase (ethylene-forming). Other names in common use include ACC oxidase, and ethylene-forming enzyme.

tructural studies

As of late 2007, two structures have been solved for this class of enzymes, with PDB accession codes PDB link|1W9Y and PDB link|1WA6.

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