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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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Related Experiment Video

Updated: Dec 15, 2025

Author Spotlight: Unraveling the Role of Myosin-7a and Usher Proteins in Hearing and Human Disease
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Author Spotlight: Unraveling the Role of Myosin-7a and Usher Proteins in Hearing and Human Disease

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A new light chain for myosin-7.

Maryna Kapustina1, Richard E Cheney2

  • 1Dept. of Cell Biology and Physiology, School of Medicine, University of North Carolina, Chapel Hill, North Carolina, USA.

The Journal of Biological Chemistry
|July 12, 2020
PubMed
Summary

Calmodulin-like protein 4 (CALML4) is identified as a component of the intestinal microvilli adhesion complex, acting as a light chain for myosin-7b (MYO7B). This finding also links CALML4 to myosin-7a (MYO7A), impacting Usher syndrome research.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • The intermicrovillar adhesion complex links intestinal microvilli tips.
  • This complex involves cadherins and the motor protein myosin-7b (MYO7B).
  • The complex shares homology with the myosin-7a (MYO7A)-based Usher syndrome complex.

Purpose of the Study:

  • To identify novel components of the intermicrovillar adhesion complex.
  • To elucidate the function of uncharacterized proteins within this complex.
  • To explore the implications for research on myosin-7a and hereditary deaf-blindness.

Main Methods:

  • Biochemical analysis to identify protein interactions.
  • Functional assays to determine protein roles.
  • Comparative analysis with homologous complexes.

Main Results:

  • Calmodulin-like protein 4 (CALML4) was identified as a component of the intermicrovillar adhesion complex.
  • CALML4 functions as a light chain for myosin-7b (MYO7B).
  • CALML4 was shown to bind to myosin-7a (MYO7A).

Conclusions:

  • CALML4 is a crucial component of the intestinal microvilli adhesion complex.
  • CALML4's interaction with MYO7B and MYO7A has significant implications for understanding microvillar structure and function.
  • This research provides new insights into the molecular basis of hereditary deaf-blindness linked to MYO7A.