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Caffeine synthase : ウィキペディア英語版
Caffeine synthase

Caffeine synthase is a methyltransferase enzyme involved in the caffeine biosynthesis pathway. It is expressed in tea species, coffee species, and cocoa species. The enzyme catalyses the following reactions:
* ''S''-adenosyl-L-methionine + theobromine \rightleftharpoons ''S''-adenosyl-L-homocysteine + caffeine + H+
* ''S''-adenosyl-L-methionine + paraxanthine \rightleftharpoons ''S''-adenosyl-L-homocysteine + caffeine + H+
* 7-methylxanthine + ''S''-adenosyl-L-methionine \rightleftharpoons ''S''-adenosyl-L-homocysteine + H+ + theobromine
Caffeine synthase is expressed in the ''Camellia'' species ''irrawadiensis'', ''ptilophylla'', and ''sinensis''; the ''Coffea'' species ''arabica'', and ''canephora''; and in ''Theobroma cacao''.
== References ==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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