Metabolic conversion of N-methyl carbon of {gamma}-glutamylmethylamide to caffeine in tea plants |
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Authors: | Konishi Shigeki; Ozasa Michiko; Takahashi Eiichi |
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Institution: | Department of Agricultural Chemistry, Kyoto University Sakyo-ku, Kyoto 606, Japan |
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Abstract: | Tea seedlings were treated with 14C-methylamine to cause synthesisof 14C- -glutamylmethylamide (N-methyl-14C). The metabolic conversionof -glutamylmethylamide was studied by tracing 14C. 14C- -Glutamylmethylamide (N-methyl-14C) translocated from rootsand cotyledons to shoots of tea seedlings, was converted almostentirely into caffeine. Conversion was greater in light-exposedsamples. For those grown in the dark, the converted amount didnot correspond to the total caffeine produced. More 14C- -glutamylmethylamidewas present in stems than in leaves, but with 14C-caffeine,the opposite was found. When 14C- -glutamylmethylamide or 14C-methylamine was appliedto leaf disks, 14C-caffeine was biosynthesized from both substances.
1 Present address: Department of Agricultural Chemistry, ShizuokaUniversity, Iwata, Shizuoka 438, Japan. (Received September 25, 1971; ) |
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