2.1.1.158 additional information enzyme expression and activity during caffeine biosynthesis in fruits, overview 2.1.1.158 S-adenosyl-L-methionine + xanthosine - 2.1.1.158 S-adenosyl-L-methionine + xanthosine first step in caffeine biosynthesis 2.1.1.158 S-adenosyl-L-methionine + xanthosine first step in caffeine biosynthesis pathway from xanthosine 2.1.1.158 S-adenosyl-L-methionine + xanthosine first step in caffeine biosynthesis pathway from xanthosine, reduction of the second enzyme of the pathway, 7-methylxanthine methyltransferase, EC 2.1.1.159, leads to reduced XMT1 expression 2.1.1.158 S-adenosyl-L-methionine + xanthosine in vivo feeding experiments with radio-labeled substrate, product determination, overview 2.1.1.158 S-adenosyl-L-methionine + xanthosine step of the caffeine biosynthesis, caffeine accumulation in seeds 2.1.1.158 S-adenosyl-L-methionine + xanthosine the enzyme is part of a caffeine biosynthetic pathway which includes a recycling of adenosine released from S-adenosyl-L-methionine in form of xanthosine monophosphate, overview