Reversal of the myosin power stroke induced by fast stretching of intact skeletal muscle fibers. 2009

Barbara Colombini, and Marta Nocella, and Giulia Benelli, and Giovanni Cecchi, and Peter J Griffiths, and M Angela Bagni
Dipartimento di Scienze Fisiologiche, Università degli Studi di Firenze, Firenze, Italy.

Force generation and movement in skeletal muscle result from a cyclical interaction of overlapping myosin and actin filaments that permits the free energy of ATP hydrolysis to be converted into mechanical work. The rapid force recovery that occurs after a step release imposed on a muscle is thought to result from a synchronized tilting of myosin lever arms toward a position of lower free energy (the power stroke). We investigated the power stroke mechanism in intact muscle fibers of Rana esculenta using a fast stretch to detach forcibly cross-bridges. Stretches were applied either with or without a conditioning step release. Cross-bridge rupture tension was not significantly influenced by the release, whereas sarcomere elongation at the rupture point increased immediately after the release and returned to the prerelease condition within 15-20 ms, following a slower time course compared to the recovery of tension. These observations suggest that the rupture force of a bridge is unaltered by a conditioning release, but rupture must first be preceded by a power stroke reversal, which restores the prepower stroke state. The sarcomere extension at the rupture point indicates both the extent of this power stroke reversal and the time course of strained bridge replenishment.

UI MeSH Term Description Entries
D007700 Kinetics The rate dynamics in chemical or physical systems.
D008954 Models, Biological Theoretical representations that simulate the behavior or activity of biological processes or diseases. For disease models in living animals, DISEASE MODELS, ANIMAL is available. Biological models include the use of mathematical equations, computers, and other electronic equipment. Biological Model,Biological Models,Model, Biological,Models, Biologic,Biologic Model,Biologic Models,Model, Biologic
D009068 Movement The act, process, or result of passing from one place or position to another. It differs from LOCOMOTION in that locomotion is restricted to the passing of the whole body from one place to another, while movement encompasses both locomotion but also a change of the position of the whole body or any of its parts. Movement may be used with reference to humans, vertebrate and invertebrate animals, and microorganisms. Differentiate also from MOTOR ACTIVITY, movement associated with behavior. Movements
D009218 Myosins A diverse superfamily of proteins that function as translocating proteins. They share the common characteristics of being able to bind ACTINS and hydrolyze MgATP. Myosins generally consist of heavy chains which are involved in locomotion, and light chains which are involved in regulation. Within the structure of myosin heavy chain are three domains: the head, the neck and the tail. The head region of the heavy chain contains the actin binding domain and MgATPase domain which provides energy for locomotion. The neck region is involved in binding the light-chains. The tail region provides the anchoring point that maintains the position of the heavy chain. The superfamily of myosins is organized into structural classes based upon the type and arrangement of the subunits they contain. Myosin ATPase,ATPase, Actin-Activated,ATPase, Actomyosin,ATPase, Myosin,Actin-Activated ATPase,Actomyosin ATPase,Actomyosin Adenosinetriphosphatase,Adenosine Triphosphatase, Myosin,Adenosinetriphosphatase, Actomyosin,Adenosinetriphosphatase, Myosin,Myosin,Myosin Adenosinetriphosphatase,ATPase, Actin Activated,Actin Activated ATPase,Myosin Adenosine Triphosphatase
D011893 Rana esculenta An edible species of the family Ranidae, occurring in Europe and used extensively in biomedical research. Commonly referred to as "edible frog". Pelophylax esculentus
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D001696 Biomechanical Phenomena The properties, processes, and behavior of biological systems under the action of mechanical forces. Biomechanics,Kinematics,Biomechanic Phenomena,Mechanobiological Phenomena,Biomechanic,Biomechanic Phenomenas,Phenomena, Biomechanic,Phenomena, Biomechanical,Phenomena, Mechanobiological,Phenomenas, Biomechanic
D013816 Thermodynamics A rigorously mathematical analysis of energy relationships (heat, work, temperature, and equilibrium). It describes systems whose states are determined by thermal parameters, such as temperature, in addition to mechanical and electromagnetic parameters. (From Hawley's Condensed Chemical Dictionary, 12th ed) Thermodynamic
D018485 Muscle Fibers, Skeletal Large, multinucleate single cells, either cylindrical or prismatic in shape, that form the basic unit of SKELETAL MUSCLE. They consist of MYOFIBRILS enclosed within and attached to the SARCOLEMMA. They are derived from the fusion of skeletal myoblasts (MYOBLASTS, SKELETAL) into a syncytium, followed by differentiation. Myocytes, Skeletal,Myotubes,Skeletal Myocytes,Skeletal Muscle Fibers,Fiber, Skeletal Muscle,Fibers, Skeletal Muscle,Muscle Fiber, Skeletal,Myocyte, Skeletal,Myotube,Skeletal Muscle Fiber,Skeletal Myocyte

Related Publications

Barbara Colombini, and Marta Nocella, and Giulia Benelli, and Giovanni Cecchi, and Peter J Griffiths, and M Angela Bagni
September 1984, Developmental biology,
Barbara Colombini, and Marta Nocella, and Giulia Benelli, and Giovanni Cecchi, and Peter J Griffiths, and M Angela Bagni
January 1980, Histochemistry,
Barbara Colombini, and Marta Nocella, and Giulia Benelli, and Giovanni Cecchi, and Peter J Griffiths, and M Angela Bagni
December 2006, American journal of physiology. Cell physiology,
Barbara Colombini, and Marta Nocella, and Giulia Benelli, and Giovanni Cecchi, and Peter J Griffiths, and M Angela Bagni
April 2021, Proceedings of the National Academy of Sciences of the United States of America,
Barbara Colombini, and Marta Nocella, and Giulia Benelli, and Giovanni Cecchi, and Peter J Griffiths, and M Angela Bagni
April 1983, The Journal of general physiology,
Barbara Colombini, and Marta Nocella, and Giulia Benelli, and Giovanni Cecchi, and Peter J Griffiths, and M Angela Bagni
May 1998, Journal of applied physiology (Bethesda, Md. : 1985),
Barbara Colombini, and Marta Nocella, and Giulia Benelli, and Giovanni Cecchi, and Peter J Griffiths, and M Angela Bagni
May 2010, Nature structural & molecular biology,
Barbara Colombini, and Marta Nocella, and Giulia Benelli, and Giovanni Cecchi, and Peter J Griffiths, and M Angela Bagni
April 1997, Proceedings of the National Academy of Sciences of the United States of America,
Barbara Colombini, and Marta Nocella, and Giulia Benelli, and Giovanni Cecchi, and Peter J Griffiths, and M Angela Bagni
September 2001, Muscle & nerve,
Barbara Colombini, and Marta Nocella, and Giulia Benelli, and Giovanni Cecchi, and Peter J Griffiths, and M Angela Bagni
December 2001, The Journal of general physiology,
Copied contents to your clipboard!