Abstract
Current theories of muscle cross-bridge function suggest that force is generated by a change in the orientation of the myosin neck region. We attached a paramagnetic probe to a subunit in the neck region and measured the orientation of the probe using electron paramagnetic resonance spectroscopy. The angle of the probes on smooth myosin S1 were changed by 20°±4° on addition of ADP (50% effect at 5±2 μM), but ADP produced little effect on skeletal S1. The orientation of smooth myosin, +ADP, resembled that of skeletal myosin, ±ADP, suggesting that the release of ADP generates an extra rotation of the neck region in smooth muscle at the end of its power stroke.
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Gollub, J., Cremo, C. & Cooke, R. ADP release produces a rotation of the neck region of smooth myosin but not skeletal myosin. Nat Struct Mol Biol 3, 796–802 (1996). https://doi.org/10.1038/nsb0996-796
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DOI: https://doi.org/10.1038/nsb0996-796
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