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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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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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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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The Role of Actin and Myosin in Non-muscle Cells01:10

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Actin and myosin or actomyosin filaments also play a significant role in cells other than those involved in muscle contraction (which occurs within the sarcomere of muscle cells). The mechanism of non-muscle cell contractile bundles was first observed in Dictyostelium and Acanthamoeba. In non-muscle cells, two bundles are commonly found: stress fibers and actomyosin adherence belts. These contractile bundles are smaller and less organized than the ones found in muscle cells. They  are held...
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The Sarcomere01:08

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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.
Each...
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Mechanical Protein Functions01:58

Mechanical Protein Functions

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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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Unconventional Myosins: How Regulation Meets Function.

Natalia Fili1, Christopher P Toseland1

  • 1Department of Oncology and Metabolism, Medical School, University of Sheffield, Sheffield S10 2RX, UK.

International Journal of Molecular Sciences
|December 22, 2019
PubMed
Summary
This summary is machine-generated.

Unconventional myosins are essential molecular motors regulating cellular functions. This review details their diverse regulatory mechanisms, ensuring precise control over their actions in various cellular processes.

Keywords:
alternative splicinganchorsauto-inhibitionbinding partnerscargo recognitioncargo transportersdimerizationloadlocal environmentregulationunconventional myosins

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Area of Science:

  • Cell Biology
  • Molecular Motors
  • Cytoskeletal Dynamics

Background:

  • Unconventional myosins are vital molecular motors involved in numerous cellular processes.
  • Their functions include cargo transport, acting as anchors, and sensing tension via the actin cytoskeleton.
  • Tight regulation of myosin activity is crucial for cellular function.

Purpose of the Study:

  • To review the regulatory mechanisms governing unconventional myosins.
  • To explore how these mechanisms adapt to specific myosin features.
  • To understand the convergence of regulatory pathways for precise functional control.

Main Methods:

  • Literature review of current research on unconventional myosin regulation.
  • Analysis of diverse regulatory strategies including alternative splicing, binding partners, phosphorylation, load, and environmental factors.
  • Synthesis of information on the interplay between different regulatory mechanisms.

Main Results:

  • Unconventional myosins exhibit diverse regulatory mechanisms.
  • Regulation occurs at multiple levels, including post-translational modifications and interactions with other molecules.
  • Specific regulatory strategies are tailored to individual myosin isoforms and their functions.
  • Convergent regulatory pathways ensure precise spatio-temporal control.

Conclusions:

  • Unconventional myosin regulation is complex and multi-faceted.
  • Understanding these regulatory networks is key to comprehending fundamental cellular processes.
  • Further research into myosin regulation can reveal insights into cellular mechanics and disease.