3 S-adenosyl-L-methionine + L-histidine = 3 S-adenosyl-L-homocysteine + hercynine (overall reaction) [RN:
R01169];
(1a) S-adenosyl-L-methionine + L-histidine = S-adenosyl-L-homocysteine + Nalpha-methyl-L-histidine [RN:
R10523];
(1b) S-adenosyl-L-methionine + Nalpha-methyl-L-histidine = S-adenosyl-L-homocysteine + Nalpha,Nalpha-dimethyl-L-histidine [RN:
R10524];
(1c) S-adenosyl-L-methionine + Nalpha,Nalpha-dimethyl-L-histidine = S-adenosyl-L-homocysteine + hercynine [RN:
R04436]
