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Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
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Related Experiment Video

Updated: Apr 26, 2026

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CARMIL membrane-binding domain regulates capping protein and actin assembly.

Olivia L Mooren1, Patrick McConnell1, James D DeBrecht1

  • 1Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St Louis, Missouri.

The Journal of Biological Chemistry
|April 24, 2026
PubMed
Summary

The CARMIL membrane binding domain targets actin capping protein (CP) to membranes, activating it for Arp2/3-based actin assembly. It then dissociates, releasing activated CP for further actin regulation.

Keywords:
Arp2/3 complexCARMILactin assemblybasiccapping proteinhydrophobic motifmembrane binding

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Area of Science:

  • Cell biology
  • Biochemistry
  • Molecular dynamics

Background:

  • Actin assembly at cell membranes is crucial for cellular functions.
  • Actin capping protein (CP) regulates actin filament dynamics.
  • CARMIL's membrane binding (MB) domain is essential for its cellular function.

Purpose of the Study:

  • Investigate the mechanism of the CARMIL MB domain in regulating CP activity.
  • Determine the role of the MB domain in actin assembly at membranes.
  • Elucidate how the MB domain influences CP's interaction with membranes and inhibitors.

Main Methods:

  • Lipid-coated bead binding assays to assess MB domain interaction.
  • Analysis of CP activity in the presence of the MB domain.
  • Investigating the dissociation of the MB domain from membranes upon CP binding.

Main Results:

  • The CARMIL MB domain binds lipid membranes and recruits CP-binding motifs (CPI and CSI).
  • MB domain binding activates CP, promoting Arp2/3-nucleated actin assembly.
  • The MB domain dissociates from the membrane after CP binding, releasing activated CP.

Conclusions:

  • The CARMIL MB domain acts as a membrane anchor to activate CP.
  • MB domain dissociation facilitates the release of activated CP from the membrane.
  • This dual function regulates actin assembly dynamics at the plasma membrane.