Suggested Reaction 2.1.1.-

Left

5,6,7,8-Tetrahydromethanopterin
+S-Adenosyl-L-methionine

Right

5-Methyl-5,6,7,8-tetrahydromethanopterin
+S-Adenosyl-L-homocysteine
+H+

[BiSSCat | GREP ]