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Structural and mechanistic dissection of the myosin start-of-power stroke state and its importance for force production

Subject Area Biochemistry
Biophysics
Structural Biology
Term from 2016 to 2021
Project identifier Deutsche Forschungsgemeinschaft (DFG) - Project number 322867023
 
Final Report Year 2021

Final Report Abstract

Over the past years our groups have been extensively working on functional and structural aspects of myosins. Helpful in this respect has been the continuous improvement and progress in protein production, the implementation and further development of a broad spectrum of kinetic and functional studies in combination with computer-assisted protein engineering, molecular modelling and X-ray structural analyses. The applied methods and techniques have formed a solid basis for studying the actomyosin system from various aspects including the cellular functions of the motors, and the development of lead compounds targeting myosin involved in diseases. In the funded project, the collaboration of our groups has resolved molecular details of mechanotransduction yet not or only partially resolved by previous approaches. The key achievements of the funded project include: 1. Deciphering force generating communication pathways in the myosin motor a. Linking the actin-binding region via the W-helix with the active site; b. Connecting the active site with the mechanical converter. 2. Experimental evidence for the start-of-power stroke state as an essential intermediate for force production. 3. Contribution of the regulatory light chains in the allosteric coupling mechanism of actomyosin communication. 4. Elucidation of the high-resolution structure of an ADP-release conformation of myosin related to the two-step mechanism of force generation. 5. Mechanisms and regulation of actin dynamics and muscle performance resolved by molecular dynamics simulations of the tropomyosin-actin complex. 6. Development and application of a new generation of thermophoresis-based phosphate and photoacoustic calcium biosensors for studying enzyme catalysis and mechanisms of cell regulation. The funded project has significantly strengthened the interaction of our groups and has highly benefitted from our individual and complementary expertise. A major achievement has been to uncover details of the complex mechanism of actomyosin communication following a comprehensive and multidisciplinary approach, made possible by the synergy of our labs. Our results allow to further refine the myosin ATPase cycle, initially proposed by Lymn and Taylor, and to quantitatively describe the events that dictate the propagation of mechanochemical coupling signals, which eventually generate force.

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