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Related Concept Videos

Actin and Myosin in Muscle Contraction01:16

Actin and Myosin in Muscle Contraction

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Actin and myosin are contractile proteins that form the sarcomere found in skeletal muscle tissues for regulating muscle contraction. Actin, a globular contractile protein, interacts with myosin for muscle contraction. The skeletal tissue appears striped or striated under a microscope due to the repeated arrangement of contractile proteins actin and myosin along the length of myofibrils. Dark A bands and light I bands repeat along myofibrils, and the alignment of myofibrils in the cell causes...
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Overview of Myosin Structure and Function01:15

Overview of Myosin Structure and Function

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Myosins are a family of molecular motor proteins, first identified in the skeletal muscles, where they are responsible for muscle contraction. Along with their role in muscle contraction, these proteins also play a role in the intracellular transport of molecules and vesicles. There are twenty-four classes of myosins based on their domain sequence and organization. Of the twenty-four, six classes (Myosin I, Myosin II, Myosin V, Myosin VI, Myosin VII, and Myosin X)  have been well...
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Role of Myosin in Cell Migration01:18

Role of Myosin in Cell Migration

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Myosins are multimeric motor proteins involved in various cellular processes such as migration, adhesion, and proliferation. Myosin II is the most common type in animal cells, which binds and cross-links actin filaments.
Myosin II  is a hexamer comprising two heavy chains with globular heads and coiled-coil tails, two regulatory light chains, and two essential light chains. The ATPase sites on the myosin heads hydrolyze ATP, and the released phosphate generates the force for contraction....
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Cross-bridge Cycle01:26

Cross-bridge Cycle

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As muscle contracts, the overlap between the thin and thick filaments increases, decreasing the length of the sarcomere—the contractile unit of the muscle—using energy in the form of ATP. At the molecular level, this is a cyclic, multistep process that involves binding and hydrolysis of ATP, and movement of actin by myosin.
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Excitation-Contraction Coupling in Skeletal Muscles01:20

Excitation-Contraction Coupling in Skeletal Muscles

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Excitation-contraction coupling is a series of events that occur between generating an action potential and initiating a muscle contraction. It occurs at the triad, a structure found in skeletal muscle fibers that comprise a T-tubule and terminal cisternae of the sarcoplasmic reticulum on each side. These triads are visible in longitudinally sectioned muscle fibers. They are typically located at the A-I junction — the junction between the A and I bands of the sarcomere.
When an action...
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Generation of Straight or Branched Actin Filaments01:14

Generation of Straight or Branched Actin Filaments

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The straight or branched structure formation of actin filaments is controlled by nucleating proteins such as the formins and Arp2/3 complex. Formin-mediated assembly results in straight filaments, whereas Arp2/3 protein complex-mediated assembly results in branched actin filaments.
Arp2/3 Complex
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...
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Related Experiment Video

Updated: Mar 14, 2026

Probing Myosin Ensemble Mechanics in Actin Filament Bundles Using Optical Tweezers
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Probing Myosin Ensemble Mechanics in Actin Filament Bundles Using Optical Tweezers

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How Myosin Generates Force on Actin Filaments.

Anne Houdusse1, H Lee Sweeney2

  • 1Structural Motility, Institut Curie, PSL Research University, CNRS, UMR 144, F-75005, Paris, France; Sorbonne Universités, UPMC Univ Paris06, Sorbonne Universités, IFD, 4 Place Jussieu, 75252 Paris cedex 05, France.

Trends in Biochemical Sciences
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PubMed
Summary

Understanding myosin

Keywords:
allosterychemo-mechanical transductionforce generationmolecular motors

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Dissecting Mechanoenzymatic Properties of Processive Myosins with Ultrafast Force-Clamp Spectroscopy
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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • The mechanism of myosin-actin interaction and force generation is debated.
  • A key controversy involves the timing of inorganic phosphate release during the myosin powerstroke.
  • Understanding this is crucial for muscle function and myosin-related diseases.

Purpose of the Study:

  • To reconcile contradictory data on myosin force generation.
  • To propose a unified model for the myosin powerstroke.
  • To clarify the sequence of events in actin-myosin interaction.

Main Methods:

  • Analysis of recent high-resolution structural data of myosin.
  • Integration of electron cryomicroscopy (cryo-EM) 3D reconstruction of actin-myosin-MgADP.
  • Reconciliation of time-resolved fluorescence resonance energy transfer (FRET) data.

Main Results:

  • Seemingly contradictory FRET data can be harmonized.
  • New structural insights illuminate the myosin powerstroke.
  • A refined understanding of the actin-myosin cycle is achieved.

Conclusions:

  • A model for myosin force generation on actin is proposed.
  • The timing of inorganic phosphate release is clarified in relation to the lever arm swing.
  • This work advances the understanding of muscle contraction and disease mechanisms.