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  • Title: Actin may contribute to the power stroke in the binary actomyosin system.
    Author: Grazi E, Magri E, Schwienbacher C, Trombetta G.
    Journal: Biochem Biophys Res Commun; 1994 Apr 15; 200(1):59-64. PubMed ID: 8166734.
    Abstract:
    At the physiological protein osmotic pressure, the angle formed between the long axis of the actin monomer and the pointed end of the filament axis is roughly 61 degrees in F-actin and about 90 degrees in the myosin subfragment 1--decorated F-actin. This implies that, in the course of the contractile cycle, actin itself contributes, by about 4 nm, to the displacement of the actin filament toward the center of the sarcomer.
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