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Interactome analysis reveals ezrin can adopt multiple conformational states.

Raghuvir Viswanatha1, Jessica Wayt, Patrice Y Ohouo

  • 1From the Department of Molecular Biology and Genetics and Weill Institute for Cell and Molecular Biology, Cornell University, Ithaca, New York 14853.

The Journal of Biological Chemistry
|October 24, 2013
PubMed
Summary

Ezrin, a protein regulating cell structure, exists in three states: closed, open, and hyperactivated. Different proteins bind to ezrin depending on its conformation, revealing new insights into cell signaling.

Keywords:
CytoskeletonEzrinPhosphorylationPlasma MembraneProteomics

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Ezrin, an ezrin-radixin-moesin (ERM) family member, is crucial for microvilli structure in epithelial cells.
  • Ezrin links membrane proteins to F-actin, switching between active (open) and inactive (closed) states, regulated by phosphorylation.
  • In vitro studies suggested a potential hyperactivated ezrin state.

Purpose of the Study:

  • To investigate the different conformational states of ezrin.
  • To identify ezrin-binding proteins across various ezrin conformations.
  • To understand how ezrin's conformation influences its interactions with other proteins.

Main Methods:

  • Unbiased proteomic analysis of ezrin-binding proteins in Jeg-3 epithelial cells.
  • Quantitative mass spectrometry to compare interactomes of wild-type, closed, open, and hyperactivated ezrin.
  • Confirmation of novel interactors via localization studies in microvilli.

Main Results:

  • Identification of novel ezrin-binding proteins, many localized to microvilli.
  • Discovery of a significant group of proteins that specifically bind to the closed conformation of ezrin.
  • Evidence supporting the existence of three distinct ezrin conformational states.

Conclusions:

  • Ezrin can exist in at least three distinct conformational states: closed, open, and hyperactivated.
  • Ligand binding to ezrin is conformation-dependent, with different proteins interacting with specific ezrin states.
  • These findings provide a deeper understanding of ezrin's regulatory mechanisms and its role in cellular processes.