ID   2.1.1.158
DE   7-methylxanthosine synthase.
AN   xanthosine methyltransferase.
AN   XMT.
AN   XRS1.
CA   S-adenosyl-L-methionine + xanthosine = 7-methylxanthosine + S-adenosyl-L-
CA   homocysteine.
CC   -!- The enzyme is specific for xanthosine, as XMP and xanthine cannot act
CC       as substrates.
CC   -!- The enzyme does not have N(1)- or N(3)- methylation activity.
CC   -!- This is the first methylation step in the production of caffeine.
DR   Q9AVK0, XMT1_COFAR ;  A4GE69, XMT1_COFCA ;  A0A096VHY7, XMT2_COFAR ;
//