Abstract
ACC oxidase catalyzes a complex reaction to form the gaseous plant hormone ethylene as shown by the following reaction equation: ACC + O2 + ascorbate ? C2H4 + HCN + CO2 + dehydroascorbate + 2H2O [1]. The reaction requires the presence of the cofactors Fe2+ [16] and CO2 [1,3]. Although the exact reaction mechanism is still unknown, it is believed that the enzymatic reaction proceeds via the intermediate N-hydroxyl-ACC, which is presumably so unstable that it fragments into C2H4 (derived from C-2,3 of ACC) and cyanoformic acid, the latter being further degraded into HCN (derived from C-1 of ACC) and CO2 (derived from the carboxyl group of ACC). The notion that ACO is a hydroxylase is supported by the amino acid sequence homology shared between ACO and a number of known hydroxylase [4] as well as by the requirement of the enzyme for molecular oxygen, Fe2+, and ascorbate for catalysis.
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© 1997 Springer Science+Business Media Dordrecht
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Charng, Yy., Liu, Y., Dong, J.G., Yang, S.F. (1997). On 1-Aminocyclopropane-1-Carboxylic Acid (ACC) Oxidase. In: Kanellis, A.K., Chang, C., Kende, H., Grierson, D. (eds) Biology and Biotechnology of the Plant Hormone Ethylene. NATO ASI Series, vol 34. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5546-5_4
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DOI: https://doi.org/10.1007/978-94-011-5546-5_4
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