GMGT-0 + 2 5'-deoxyadenosine + 2 L-methionine + A + 2 H(+) => GDGT-0 + AH2 + 2 S-adenosyl-L-methionine
gmgt-0 + 2 5'-deoxyadenosine + 2 l-methionine + a + 2 h(+) => gdgt-0 + ah2 + 2 s-adenosyl-l-methionine