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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 ''S''-adenosyl-L-homocysteine + caffeine + H+ * ''S''-adenosyl-L-methionine + paraxanthine ''S''-adenosyl-L-homocysteine + caffeine + H+ * 7-methylxanthine + ''S''-adenosyl-L-methionine ''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 ==
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