Peroxidases from grapevine

The synthesis of /raw5-resveratrol oligomers requires the set of enzymes that yield trows-resveratrol from the phenylpropanoid precursor, p-coumaryl-CoA and malonyl-CoA, and then the oxidative coupling of resveratrol units by a phenol oxidase, which is presumably a class HI plant peroxidase [138,139], In fact, class HI plant peroxidases, such as that purified from grapevines, are able to oxidize frvms-resveratrol with values of 17-93 pM for H2O2 concentrations ranging from 0.1 to 5.0 mM at pH 4.0 [58], and with values of 11.9 pM" s, at the same pH [35,58]. 

Cinnamyl alcohols are dimerized in cell walls by peroxidases in a reaction dependent on H2O2 [105]. In fact, class IE plant peroxidases, such as that purified from barley [34] and grapevine [35], are capable of oxidizing coniferyl alcohol with 3 values of 2.4 and 3.0 s at pH 3.96... 

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