Abstract
Prenyltransferase (farnesyl pyrophosphate synthetase) [EC 2.5.1.1] and isopentenylpyrophosphate isomerase [EG 5.3.3.2] were obtained and partially purified from pumpkin fruit. The prenyltransferase preparation catalyzed the condensation of isopentenyl pyrophosphate with dime-thylallyl pyrophosphate as well as with geranyl pyrophosphate to yield trans-trans farnesyl pyrophosphate as a final product, and was free of isopentenyl pyrophosphate isomerase and geranylgeranyl pyrophosphate synthetase activities. Prenyltransferase of pumpkin has properties similar to those of pig liver, showing requirement of Mg++, Km value of 1.3 × 10−6M for geranyl pyrophosphate, and pH optimum at 7.5.
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