Abstract
A central question in muscle contraction is “How is the energy release in ATP hydrolysis converted into mechanical force and work?” With the elucidation of the actomyosin ATPase reaction in the 1970s (1,2) and the fact that a large amount of free energy is produced during Pi release from an actomyosin-ADP-Pi species (3), the Pi release step from actomyosin-ADP-Pi must be associated with the generation of force and shortening. It was also known that increases in the [Pi] concentration in isometrically contracting skinned muscle fibers reduced isometric force (4).
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