Abstract
Cell-free extracts of Tanacetum vulgare, Artemisia annua, and Santolina chamaecyparissus contain seasonally-dependent enzyme systems that convert IPP§, DMAPP, GPP and NPP into water-soluble products in up to 96% yield. 3-Methyl-3,4-oxidobutan-1-ol; 3-methylbutan-1,3,4-triol; 3,7-dimethyl-6,7-oxido-octa- trans-2-en-1-ol; and 3,7-dimethylocta- trans,trans-2,5-dien-1,7-diol were major products when IPP and GPP respectively were substrates and several other terpene epoxides and their ring-opened products were tentatively identified. 2-CEPA blocked formation of diols from the epoxides. The occurrence of these enzymes accounts for some hitherto puzzling observations that have arisen in studies of monoterpene biosynthesis both in vivo and in vitro.
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