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Bidirectional signals transduced by DAPK-ERK interaction promote the apoptotic effect of DAPK

Chun-Hau Chen1, Won-Jing Wang, Jean-Cheng Kuo

  • 1Institute of Molecular Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan.

The EMBO Journal
|December 24, 2004
PubMed

Insights

Extracellular signal-regulated kinase (ERK) phosphorylates Death-associated protein kinase (DAPK), enhancing its apoptotic activity. DAPK, in turn, inhibits ERK signaling, creating a feedback loop that promotes cell death.

Area of Science:

  • Cellular signaling
  • Molecular biology
  • Apoptosis research

Background:

  • Death-associated protein kinase (DAPK) is a key regulator of apoptosis.
  • Extracellular signal-regulated kinase (ERK) is involved in various cellular processes, including proliferation and survival.

Purpose of the Study:

  • To investigate the interaction between DAPK and ERK.
  • To elucidate the functional consequences of this interaction on apoptosis.

Main Methods:

  • Co-immunoprecipitation to identify protein interactions.
  • In vitro kinase assays to assess phosphorylation.
  • In vivo studies to evaluate cellular localization and apoptosis induction.

Main Results:

  • ERK directly interacts with DAPK via a docking sequence in DAPK's death domain.
  • ERK phosphorylates DAPK at Ser 735, increasing DAPK's catalytic activity.
  • DAPK promotes cytoplasmic retention of ERK, inhibiting nuclear ERK signaling.
  • This reciprocal regulation forms a positive feedback loop enhancing DAPK's apoptotic function.

Conclusions:

  • Bidirectional signaling between DAPK and ERK creates a positive feedback loop that promotes apoptosis.
  • The interplay between DAPK and ERK is crucial for efficient apoptosis induction.
  • DAPK's death domain plays a role in regulating ERK signaling to promote cell death.

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