Abstract
A mechanistic model of peroxidase-catalyzed oxidation of indole-3-acetic acid (IAA) at neutral pH has been developed, characterized, and compared with experiments. The model is based on experimental facts showing that IAA is oxidized in the presence of HRP by two pathways: (i) the standard peroxidase cycle, which is accompanied by (ii) a nonenzymatic free radical chain reaction. The peroxidase cycle normally requires the addition of a hydroperoxide, whereas IAA oxidation does not. Therefore, the model includes the enzymatic peroxidase cycle which is initiated by organic hydroperoxide (ROOH) derived from autoxidation of IAA. It also includes a nonenzymatic free radical chain which utilizes oxygen, oxidizes IAA, and recycles ROOH required for the enzymatic cycle. Available experimental values of rate constants were used. Unavailable rate constants were initially estimated analytically using the steady state assumption and then optimized by computer simulation. There is a unique set of rate constants which ...
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