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|Section2= |Section3= }} Xanthosine is a nucleoside derived from xanthine and ribose. It is the biosynthetic precursor to 7-methylxanthosine by the action of 7-methylxanthosine synthase. 7-Methylxanthosine in turn is the precursor to theobromine (active alkaloid in chocolate), which in turn is the precursor to caffeine, the alkaloid in coffee and tea.〔Ashihara, Hiroshi; Yokota, Takao; Crozier, Alan "Biosynthesis and catabolism of purine alkaloids" Advances in Botanical Research 2013, vol. 68, 111-138. http://dx.doi.org/10.1016/B978-0-12-408061-4.00004-3〕 ==See also== * Xanthosine monophosphate * Xanthosine diphosphate * Xanthosine triphosphate 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Xanthosine」の詳細全文を読む スポンサード リンク
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