Aminocyclopropanecarboxylate oxidase

In enzymology, an aminocyclopropanecarboxylate oxidase is an enzyme that catalyzes the chemical reaction


 * 1-aminocyclopropane-1-carboxylate + ascorbate + O2 $$\rightleftharpoons$$ 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.

Structural studies
As of late 2007, two structures have been solved for this class of enzymes, with PDB accession codes and.