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- W1488200731 abstract "1 The incorporation of (3RS)-[2-14C,(4R)-4-3H1]mevalonic acid and (3RS)-[214-C,(4S)-4-3H1]-mevalonic acid into plastoquinone, ubiquinone, γ-tocopherol, α-tocopherol, α-tocopherol quinone, β-carotene, squalene and 3β-hydroxysterols by maize shoots has been studied. 2 In agreement with the findings of workers using other tissues the atomic 14C/3H ratios for β-carotene, squalene and 3β-hydroxysterols labelled from [2-14C,4R-3H1]mevalonic acid are found to be 8:6, 6:6 and 5:3. When [2-14C,4S-3H1]mevalonic acid is used 3H is found to be entirely absent. 3 All the quinones and chromanols examined gave results which are consistent with the prenyl portions of these molecules being biogenetically all-trans. Thus using [2-14C,4R-3H1]mevalonic acid the atomic 14C/3H ratios of ubiquinone, plastoquinone, phylloquinone, γ-tocopherol, α-tocopherol and α-tocopherol quinone are found to be 9:9, 9:9, 4:4, 4:4, 4:4, and 4:4. Confirmation of these results is provided by the finding that when [2-14C,4S-3H1]mevalonic acid is used only 14C radioactivity appears in the assembled molecules. 4 Specific activity data suggest that γ-tocopherol may be a precursor of α-tocopherol, and that α-tocopherol and α-tocopherol quinone are in equilibrium with each other." @default.
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- W1488200731 date "1968-04-01" @default.
- W1488200731 modified "2023-10-18" @default.
- W1488200731 title "Biosynthesis of Phytoquinones. Stereospecific Biosynthesis of the Polyprenyl Side Chains of Terpenoid Quinones and Chromanols in Maize Shoots" @default.
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- W1488200731 doi "https://doi.org/10.1111/j.1432-1033.1968.tb00214.x" @default.
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