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A short-chain prenyl diphosphate synthase in an Escherichia coli mutant that lacked the gene coding for farnesyl diphosphate synthase, ispA, was separated from other prenyl diphosphate synthases by DEAE-Toyopearl column chromatography. The purified enzyme catalyzed the condensation of isopentenyl diphosphate with dimethylallyl diphosphate to form farnesyl diphosphate and geranylgeranyl diphosphate.
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