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The biosynthetic origin of isopentenyl diphosphate in the polyisoprenoid biosynthesis of the rubber-producing plant Eucommia ulmoides Oliver was elucidated for the fi rst time by feeding experiments using 13C-labeled isotopomers of (RS)-mevalonate, 1-deoxy- D -xylulose- 3,4,5-triacetate, 2C-methyl- D -erythritol-1,2,3,4-tetraacetate, and pyruvate. After  13 C-labeled isotopomers were fed to the young seedlings, the polyisoprenoid fractions were prepared and analyzed by  13 C NMR. The NMR data showed that the isoprene units of polyisoprenoid derived from isopentenyl diphosphate, which was biosynthesized using both mevalonate and 1-deoxy- D -xylulose-5-phosphate in E. ulmoides. It is assumed that the cross-talk of isopentenyl diphosphate, derived from both pathways, occurs during the biosynthesis of polyisoprenoid; therefore, it was observed in the formation of low-molecular weight isoprenoids.

zeitschrift für naturforschung c

Contribution of Mevalonate and Methylerythritol Phosphate Pathways to Polyisoprenoid Biosynthesis in the Rubber-Producing Plant Eucommia ulmoides Oliver