产品内容
本酶催化的反应为(1) S-Adenosyl-L-Methionine + 3,7-Dimethylxanthine = S-Adenosyl-L-Homocysteine + 1,3,7-Trimethylxanthine;;(2) S-Adenosyl-L-Methionine + 1,7-Dimethylxanthine = S-Adenosyl-L-Homocysteine + 1,3,7-Trimethylxanthine;;(3) S-Adenosyl-L-Methionine + 7-Methylxanthine = S-Adenosyl-L-Homocysteine + 3,7-Dimethylxanthine，系统名称为S-Adenosyl-L-Methionine:3,7-Dimethylxanthine N1-Methyltransferase，副黄嘌呤是该酶的最佳底物，但副黄嘌呤途径被认为是咖啡碱生物合成的一条次要途径 [2,3]。
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