Plants produce low molecular weight compounds with antimicrobial activity in response to microbial attack termed phytoalexins. The first phytoalexin identified was (+) pisatin from pea, and several fungi are able to detoxify pisatin to a less inhibitory compound, including F. oxysporum f. sp. pisi. This detoxification is catalyzed by demethylation of the compound (termed pisatin demethylase activity, or PDA) by the cytochrome P450, Pda. Here we detail two procedures to assess PDA using radiolabeled [C]pisatin as a substrate and monitoring activity using a scintillation counter.
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