L-homocysteine + ATP <=> L-homocysteine thiolactone + AMP + diphosphate
l-homocysteine + atp <=> l-homocysteine thiolactone + amp + diphosphate
L-homocysteine + ATP <=> L-homocysteine thiolactone + AMP + diphosphate
l-homocysteine + atp <=> l-homocysteine thiolactone + amp + diphosphate