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Related Concept Videos

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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Actin and Myosin in Muscle Contraction01:16

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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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Excitation-Contraction Coupling in Skeletal Muscles01:20

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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.
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Cross-bridge Cycle01:26

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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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ATP Synthase: Mechanism01:48

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In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
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Mechanical Protein Functions01:58

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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. 
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Related Experiment Video

Updated: Jul 12, 2025

Dissecting Mechanoenzymatic Properties of Processive Myosins with Ultrafast Force-Clamp Spectroscopy
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How myosin VI traps its off-state, is activated and dimerizes.

Louise Canon1, Carlos Kikuti1, Vicente J Planelles-Herrero1

  • 1Structural Motility, UMR 144 CNRS/Curie Institute, PSL Research University, 26 rue d'Ulm, 75258, Paris cedex 05, France.

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Myosin VI (Myo6) partners differentially control its activity and localization. This regulation is crucial for cellular functions, with specific mutations impacting Myo6 auto-inhibition and dimerization.

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Area of Science:

  • Cell Biology
  • Molecular Motors
  • Protein Structure and Function

Background:

  • Myosin VI (Myo6) is a unique minus-end directed actin nanomotor essential for various cellular processes.
  • Myo6 function depends on precise regulation of its motor activity, including an auto-inhibited off-state and interactions with binding partners.

Purpose of the Study:

  • To elucidate the regulatory mechanisms of Myosin VI (Myo6) activity and localization.
  • To investigate how different Myo6 partners influence its auto-inhibition, activation, and dimerization.
  • To understand the structural basis of Myo6 regulation and the impact of a deafness mutation.

Main Methods:

  • Structural biology (crystal structure of the proximal dimerization domain)
  • Functional assays to assess Myo6 partner interactions and activation
  • Cellular studies in HeLa cells to evaluate endocytosis and dimerization
  • Analysis of the L926Q deafness mutation's effect on Myo6 regulation

Main Results:

  • Myo6 partners exhibit differential binding and regulatory effects; TOM1 and Dab2 do not bind the off-state, while GIPC1 binding releases auto-inhibition and promotes dimerization.
  • The proximal dimerization domain is critical for Myo6 function, as its disruption impairs endocytosis.
  • The L926Q deafness mutation disrupts Myo6 auto-inhibition and indirectly affects proximal dimerization.

Conclusions:

  • Myosin VI (Myo6) regulation is significantly controlled by its interaction partners, influencing auto-inhibition, localization, and activation.
  • Myo6 dimerization is essential for its cellular functions, particularly endocytosis.
  • Understanding Myo6 regulation provides insights into the molecular basis of deafness mutations.