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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...

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.

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....

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...

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Related Experiment Video

Updated: Jun 4, 2025

Myosin-Specific Adaptations of In vitro Fluorescence Microscopy-Based Motility Assays

Myosin-Specific Adaptations of In vitro Fluorescence Microscopy-Based Motility Assays

Published on: February 4, 2021

Expression, Purification, and In Vitro Analysis of Myosin.

Glenn Carrington^1,2, Yasuharu Takagi^3,4, Oliver Umney^1,2,4

¹Astbury Centre for Structural and Molecular Biology, University of Leeds, Leeds, UK.

Methods in Molecular Biology (Clifton, N.J.)

|December 20, 2024

Summary

This chapter details expressing and purifying myosin motor proteins using insect cells. It covers quality assessment and in vitro actin-binding assays, adaptable for advanced MINFLUX imaging.

Keywords:

Actin In vitro motility Mass photometry Myosin Negative-stain electron microscopy

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Last Updated: Jun 4, 2025

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Probing Myosin Ensemble Mechanics in Actin Filament Bundles Using Optical Tweezers

Probing Myosin Ensemble Mechanics in Actin Filament Bundles Using Optical Tweezers

Published on: May 4, 2022

Area of Science:

Biochemistry
Molecular Biology
Cell Biology

Background:

Understanding cytoskeletal molecular motors like myosin is crucial for cell mechanics.
Traditional methods involve protein expression, purification, and in vitro assays.

Purpose of the Study:

To provide a comprehensive protocol for myosin expression and purification.
To detail methods for characterizing myosin quality.
To describe in vitro actin-binding assays and their adaptation for MINFLUX imaging.

Main Methods:

Myosin expression and purification using an insect cell system.
Quality control of purified myosin via mass photometry and negative-stain electron microscopy (EM).
In vitro motility assays with fluorescently labeled myosin and actin tracks, including MINFLUX adaptation.

Main Results:

A reproducible protocol for obtaining high-quality, purified myosin.
Successful characterization of myosin using biophysical techniques.
Demonstration of in vitro actin-based motility assays.

Conclusions:

The described methods enable robust study of myosin mechanics and kinetics.
The protocol facilitates adaptation for super-resolution imaging techniques like MINFLUX.
This work provides a valuable resource for researchers studying cytoskeletal motor proteins.