Localization of g2 light chain in the link between the heads and tail of cardiac myosin.

Cardiac myosin liberated 1.99 mol of acetate per mol after acid hydrolysis. The myosin subfragment-1, which cannot bind g2 light chain, liberated 0.85-1.16 mol of acetate per mol. On the other hand, negligible amounts of acetate could be detected from g1 and g2 light chains. The acetates, which were measured by a microenzymic method, were derived from the acetylated N-terminal of the heavy chain. It was concluded that g2 light chain is bound to the C-terminal region of subfragment-1, which is the link between the heads and tail of myosin.