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Related Concept Videos

Actin and Myosin in Muscle Contraction01:16

Actin and Myosin in Muscle Contraction

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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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Overview of Myosin Structure and Function01:15

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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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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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An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
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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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Myosin IXb is involved in multiple pathological conditions.

Shufeng Dong1, Kai Wang1, Feng-Shuang Yi2

  • 1Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China.

Peerj
|February 11, 2026
PubMed
Summary

Myosin IXb (Myo9b) is a motor protein regulating cell movement. Recent research highlights its significant roles in immune responses, inflammation, and diseases, suggesting Myo9b as a potential therapeutic target.

Keywords:
MetastasisMyo9bRhoATight junctionTumor immunity

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Immunology

Background:

  • Myosin IXb (Myo9b) is a unique motor protein within the myosin superfamily.
  • It possesses a Rho GTPase-activating protein domain, crucial for cytoskeletal regulation and cell migration.
  • While previously studied for epithelial repair and immune cell motility, its broader roles are increasingly recognized.

Purpose of the Study:

  • To comprehensively review the structural features, regulatory mechanisms, and biological functions of Myo9b.
  • To highlight the emerging roles of Myo9b in immune regulation, inflammation, and autoimmune diseases.
  • To explore the potential of Myo9b as a therapeutic target in various pathological conditions.

Main Methods:

  • Literature review and synthesis of existing research on Myosin IXb.
  • Analysis of structural characteristics and functional domains of Myo9b.
  • Examination of Myo9b's involvement in cellular processes and disease pathogenesis.

Main Results:

  • Myo9b's unique Rho GTPase-activating protein domain is key to its function in cytoskeletal dynamics.
  • Evidence suggests Myo9b significantly influences immune cell function, inflammatory pathways, and tumorigenesis.
  • Its dysregulation is implicated in several autoimmune diseases.

Conclusions:

  • Myosin IXb plays multifaceted roles beyond its established functions, particularly in immunity and disease.
  • Understanding Myo9b's mechanisms offers insights into pathological processes.
  • Myo9b represents a promising target for novel therapeutic strategies in autoimmune diseases and cancer.