2-oxobutanoate + hydrogen sulfide + NH4(+) + H(+) => L-homocysteine + H2O
2-oxobutanoate + hydrogen sulfide + nh4(+) + h(+) => l-homocysteine + h2o
2-oxobutanoate + hydrogen sulfide + NH4(+) + H(+) => L-homocysteine + H2O
2-oxobutanoate + hydrogen sulfide + nh4(+) + h(+) => l-homocysteine + h2o