L-homocysteine + ATP + H(+) = L-homocysteinyl-AMP + diphosphate
l-homocysteine + atp + h(+) = l-homocysteinyl-amp + diphosphate
L-homocysteine + ATP + H(+) = L-homocysteinyl-AMP + diphosphate
l-homocysteine + atp + h(+) = l-homocysteinyl-amp + diphosphate