S-adenosyl-L-methionine + NAD(+) = (4aR,7S)-2-(adenosyl(5')diphospho(5)ribosyl)-7-amino-4-carbamoyl-4a,5,6,7-tetrahydro-2H-cyclopenta[c]pyridine-7-carboxylate + S-methyl-5'-thioadenosine + 2 H(+) — reaction