Trihydroxypterocarpan dimethylallyltransferase (, dimethylallylpyrophosphate:3,6a,9-trihydroxypterocarpan dimethylallyltransferase, dimethylallylpyrophosphate:trihydroxypterocarpan dimethylallyl transferase, dimethylallyl-diphosphate:(6aS,11aS)-3,6a,9-trihydroxypterocarpan dimethyltransferase) is an enzyme with systematic name dimethylallyl-diphosphate:(6aS,11aS)-3,6a,9-trihydroxypterocarpan dimethylallyltransferase. It catalyses two related chemical reactions in which an prenyl unit is added to a phenyl ring. The enzyme uses dimethylallyl pyrophosphate to provide the five-carbon fragment, with pyrophosphate (PPi) as a byproduct:
The enzyme can also catalyse the addition of the prenyl group at the alternative position next to the oxygen of the dihydropyran ring, giving 4-dimethylallylglycinol.
These compounds are intermediates in glyceollin biosynthesis in soybean. The final step is catalysed by the enzyme glyceollin synthase.
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