Related Experiment Video

Updated: Oct 23, 2025

Amide Hydrogen/Deuterium Exchange & MALDI-TOF Mass Spectrometry Analysis of Pak2 Activation
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Amide Hydrogen/Deuterium Exchange & MALDI-TOF Mass Spectrometry Analysis of Pak2 Activation

Published on: November 26, 2011

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14-3-3 proteins inactivate DAPK2 by promoting its dimerization and protecting key regulatory phosphosites

Matej Horvath1,2, Olivia Petrvalska1,2, Petr Herman3

  • 1Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University, Prague, Czech Republic.

Communications Biology
|August 20, 2021
PubMed

Insights

This study reveals how 14-3-3 proteins bind to Death-associated protein kinase 2 (DAPK2), inhibiting its activity. This structural insight into the DAPK2:14-3-3 complex offers potential for new anti-inflammatory treatments.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Cell Biology

Background:

  • Death-associated protein kinase 2 (DAPK2) is a key regulator of apoptosis, autophagy, and cell motility.
  • DAPK2 activity is modulated by autoinhibition, autophosphorylation, dimerization, and interaction with 14-3-3 proteins.
  • The precise structural mechanisms of 14-3-3-mediated DAPK2 regulation are not fully understood.

Purpose of the Study:

  • To structurally and biochemically characterize the full-length human DAPK2:14-3-3 complex.
  • To elucidate the mechanism of 14-3-3-mediated inhibition of DAPK2 activity.
  • To explore the therapeutic potential of targeting the DAPK2:14-3-3 interaction.

Main Methods:

  • X-ray crystallography to determine the structure of the DAPK2:14-3-3 complex.
  • Biophysical techniques to analyze protein interactions and complex formation.
  • Biochemical assays to assess enzyme activity and binding affinities.

Main Results:

  • Phosphorylation at DAPK2 Thr369 creates a high-affinity binding site for 14-3-3 proteins (canonical mode III).
  • Fusicoccin A enhances the binding of 14-3-3 to DAPK2.
  • 14-3-3 binding stabilizes DAPK2 dimers, protecting the inhibitory Ser318 phosphorylation site and preventing Ca2+/CaM binding, thus inhibiting DAPK2 activity.

Conclusions:

  • The study provides detailed mechanistic insights into how 14-3-3 proteins inhibit DAPK2 activity through structural stabilization.
  • The findings highlight the DAPK2:14-3-3 complex as a potential therapeutic target for inflammatory diseases.

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