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Literature DB >> 9147987

Rapid regeneration of power stroke in contracting muscle by attachment of second myosin head.

Abstract

When Lombardi and colleagues reported the phenomenon of rapid regeneration of the power stroke after a quick release of muscle fibre during a tetanus, they gave an explanation in terms of detachment of cross-bridges and re-attachment further along the thin filament. We show here that the phenomenon can also be explained on assumptions that lead to a majority of myosin molecules being attached by only one head during steady isometric contraction; the other head may then become attached after a quick release and can add its contribution to the early tension recovery after a second release.

Entities: Disease Gene

Mesh：

Substances：
Myosins

Year: 1997 PMID： 9147987 DOI： 10.1023/a:1018641218961

Source DB: PubMed Journal: J Muscle Res Cell Motil ISSN： 0142-4319 Impact factor: 2.698

12 in total

Rapid regeneration of power stroke in contracting muscle by attachment of second myosin head.

1. Muscle. A fine time for contractual alterations.

2. Small segmental rearrangements in the myosin head can explain force generation in muscle.

3. Filament compliance and tension transients in muscle.

4. Active and rigor muscle stiffness [proceedings].

5. Tension responses to sudden length change in stimulated frog muscle fibres near slack length.

6. Proposed mechanism of force generation in striated muscle.

7. A program for developing a comprehensive mathematical description of the crossbridge cycle of muscle.

8. Cross-bridge detachment and attachment following a step stretch imposed on active single frog muscle fibres.

9. Rapid regeneration of the actin-myosin power stroke in contracting muscle.

10. On the regeneration of the actin-myosin power stroke in contracting muscle.

Review 1. Mechanics and models of the myosin motor.

2. Axial disposition of myosin heads in isometrically contracting muscles.

3. A combined mechanical and X-ray diffraction study of stretch potentiation in single frog muscle fibres.

4. Energy transfer during stress relaxation of contracting frog muscle fibres.

5. Kinetic effects of fiber type on the two subcomponents of the Huxley-Simmons phase 2 in muscle.

6. Instabilities in the transient response of muscle.

7. Nonlinear cross-bridge elasticity and post-power-stroke events in fast skeletal muscle actomyosin.

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

9. The mechanism of the resistance to stretch of isometrically contracting single muscle fibres.

10. Cooperativity between the two heads of rabbit skeletal muscle heavy meromyosin in binding to actin.