Yep - the old fact that anything binding to a protein can potentially change its conformation, through interaction with, addition of, or rearrangement of its intramolecular interactions (hydrophobic / hydrogen bonds / etc).
One point of interest to add - ATP binding to the myosin globular heads is required following the power stroke, to release the myosin head from the actin. In death, once intracellular ATP reserves are quickly used up, the myosin and actin filaments remain locked together, the muscle is contraced, producing the effects of rigor mortis.