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Towards a molecular mechanism for the crossbridge cycle
J S Wray1, R S Goody, K C Holmes
1Abteilung Biophysik, Max-Planck-Institut für Medizinische Forschung, Heidelberg, F.R.G.
Advances in Experimental Medicine and Biology
|January 1, 1988
Summary
This review explains crossbridge behavior using Eisenberg-Hill concepts. Structural evidence suggests myosin molecule changes are key to the muscle power stroke.
Area of Science:
- Muscle physiology
- Biophysics
- Molecular biology
Background:
- Understanding muscle contraction mechanisms is crucial.
- The Eisenberg-Hill model provides a framework for crossbridge function.
- Previous models may not fully capture myosin's role.
Purpose of the Study:
- To review current evidence on crossbridge behavior.
- To interpret this evidence through the lens of Eisenberg-Hill concepts.
- To propose an updated conceptual model of the muscle power stroke.
Main Methods:
- Literature review of existing structural and functional studies.
- Analysis of experimental data on muscle crossbridges.
- Synthesis of evidence to support or refine theoretical models.
Main Results:
- Evidence supports the inclusion of myosin molecule morphological changes.
- These changes are integral to the power stroke mechanism.
- Existing structural data in intact muscle aligns with this refined model.
Conclusions:
- The Eisenberg-Hill model can be enhanced by incorporating myosin structural dynamics.
- A revised conceptual model, including myosin's morphological changes, better explains crossbridge function.
- This provides a more comprehensive understanding of muscle contraction at the molecular level.