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Related Concept Videos

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Structural insights into calcium-induced conformational changes in human gelsolin.

Han-Ul Kim1, Yoon Ho Park2, Mi Young An2

  • 1Department of Biochemistry, College of Natural Sciences, Kangwon National University, Chuncheon, 24341, Republic of Korea; Kangwon Center for Systems Imaging, Chuncheon, 24341, Republic of Korea.

Biochemical and Biophysical Research Communications
|October 19, 2024
PubMed
Summary

Calcium ions induce subtle structural changes in gelsolin, preparing it to bind and regulate actin filaments. This study visualizes full-length gelsolin, clarifying its interaction with actin.

Keywords:
Actin-binding proteinActin-severingConformational changeCytoskeletonGelsolinTransmission electron microscopy

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Cell Biology

Background:

  • Gelsolin is an actin-binding protein crucial for cytoskeleton regulation.
  • It severs and caps filamentous actin, with calcium ions influencing its activity.

Purpose of the Study:

  • To visualize the full-length gelsolin structure and elucidate its calcium-dependent interaction with actin filaments.
  • To understand the conformational changes preceding gelsolin's active state.

Main Methods:

  • Single-particle 3D reconstruction using electron microscopy (EM).
  • Molecular dynamics simulations.

Main Results:

  • Calcium ions induce subtle, domain-level structural changes in gelsolin prior to actin binding.
  • These changes represent a preparatory phase for gelsolin's active state.
  • Upon actin interaction, gelsolin undergoes more significant structural alterations for binding and severing.

Conclusions:

  • This is the first visualization of full-length gelsolin, providing structural insights into its calcium-mediated activation.
  • The findings clarify the mechanism by which gelsolin regulates the actin cytoskeleton.