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Overview of Myosin Structure and Function

Overview of Myosin Structure and Function

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...

The Movement of Organelles and Vesicles

The Movement of Organelles and Vesicles

In eukaryotic cells, cytoskeletal filaments such as actin, microtubules, and intermediate filaments form a mesh-like cytoskeletal network. These filaments serve as tracks for transporting cellular cargo. Specialized motor proteins use the chemical energy stored in adenosine triphosphate (ATP) for this transport. During interphase, microtubules are polarized, with the plus-end towards the cell periphery and the minus-end towards the cell center. Two microtubule-associated motor proteins,...

Actin and Myosin in Muscle Contraction

Actin and Myosin in Muscle Contraction

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...

Role of Myosin in Cell Migration

Role of Myosin in Cell Migration

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....

Mechanical Protein Functions

Mechanical Protein Functions

Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force.

Cross-bridge Cycle

Cross-bridge Cycle

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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Related Experiment Video

Updated: Dec 30, 2025

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

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

Published on: July 1, 2021

Myosin V executes steps of variable length via structurally constrained diffusion.

David Hathcock¹, Riina Tehver², Michael Hinczewski³

¹Department of Physics, Cornell University, Ithaca, United States.

|January 16, 2020

Summary

This summary is machine-generated.

Myosin V

Keywords:

actin diffusion lever arm molecular biophysics motor protein myosin V none physics of living systems structural biology

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Last Updated: Dec 30, 2025

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

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Published on: July 1, 2021

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Probing Myosin Ensemble Mechanics in Actin Filament Bundles Using Optical Tweezers

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Published on: May 4, 2022

Area of Science:

Molecular biology
Biophysics
Cellular mechanics

Background:

Myosin V is a molecular motor crucial for intracellular cargo transport.
It moves along actin filaments through a stepping mechanism.
Previous models assumed free rotation of the myosin lever arm joint.

Purpose of the Study:

To investigate the controversy regarding the myosin V lever arm joint's rotational freedom.
To model myosin V diffusion and stepping with a structurally constrained joint.
To determine the biological significance of this constraint.

Main Methods:

Comprehensive analytical modeling of myosin V diffusion.
Numerical simulations of myosin V stepping dynamics.
Comparison of model predictions with experimental data on diffusion and load dependence.

Main Results:

The constrained diffusion model accurately reproduces experimentally observed myosin V diffusion patterns.
The model provides estimates for the energy associated with the joint's constraint.
Consistency was found between the constrained model and previous measurements of step size and load dependence.

Conclusions:

A constrained myosin V lever arm joint is consistent with experimental observations.
This constraint influences myosin V's diffusive search and stepping behavior.
The study offers testable predictions for myosin V dynamics under various conditions, including off-axis forces.