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Related Concept Videos

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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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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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Actin Filament Depolymerization01:19

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Actin filaments (F-actin) are composed of actin subunits. The dissociation of actin monomers can occur from either end of F-actin. The rate of dissociation is faster from the minus-end or the pointed end, where the actin subunits exist with a bound ADP, together known as ADP-actin. The depolymerization of F-actin is aided by proteins, including the actin-depolymerizing factor (ADF) and cofilin family of proteins, gelsolin, and glia maturation factor (GMF).
In F-actin, the ADF/cofilin proteins...
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The Sarcomere01:08

The Sarcomere

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A sarcomere is a microscopic segment repeating in a myofibril. The sarcomere fundamentally consists of two main myofilaments: thick filaments called myosin and thin filaments called actin. These filaments interact by sliding past each other in response to stimulus. In addition to myosin and actin, several other proteins, such as tropomyosin, troponin, titin, nebulin, myomesin, α-actinin, and dystrophin, play crucial roles in regulating, structuring, and functioning of the sarcomere.
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Actin Polymerization01:42

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Actin polymerization occurs through the head-to-tail association of binding sites on monomeric actin or G-actin to form filamentous or F-actin. The polymerization can be divided into three phases ̶  nucleation, elongation, and steady-state phase.
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Role of Myosin in Cell Migration01:18

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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.
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Related Experiment Video

Updated: Jan 3, 2026

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

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Myosin 1b is an actin depolymerase.

Julien Pernier1,2,3, Remy Kusters1,2,4, Hugo Bousquet2,3

  • 1Laboratoire Physico-Chimie Curie, Institut Curie, PSL Research University, CNRS UMR168, 75005, Paris, France.

Nature Communications
|November 16, 2019
PubMed
Summary
This summary is machine-generated.

Myosin 1b enhances actin depolymerization at the barbed end, unlike myosin II. This study identifies a non-conventional myosin motor as a novel actin depolymerase with unique barbed end interactions.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Biophysics

Background:

  • Actin dynamics are crucial for cellular functions.
  • Non-conventional myosin motors are implicated in regulating actin dynamics.

Purpose of the Study:

  • To investigate the role of myosin 1b in actin dynamics.
  • To determine if myosin 1b acts as an actin depolymerase.

Main Methods:

  • Sliding motility assays were employed.
  • Myosin 1b was immobilized or bound to a fluid bilayer.
  • Actin depolymerization was measured at the barbed end.

Main Results:

  • Sliding on myosin 1b enhanced actin depolymerization at the barbed end.
  • Myosin II, despite faster sliding, did not affect actin depolymerization.
  • Myosin 1b exhibits unique interactions with the actin barbed end.

Conclusions:

  • Myosin 1b functions as an actin depolymerase.
  • Non-conventional myosins can regulate actin turnover.
  • Specific myosin-actin interactions dictate functional outcomes.