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Related Experiment Videos

Competing docking interactions can bring about bistability in the MAPK cascade.

Stefan Legewie1, Birgit Schoeberl, Nils Blüthgen

  • 1Institute for Theoretical Biology, Humboldt University, Berlin, Germany. s.legewie@biologie.hu-berlin.de

Biophysical Journal
|May 29, 2007
PubMed
Summary
This summary is machine-generated.

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A novel positive-feedback loop involving Erk sequestration of Mek was discovered in the Raf-Mek-Erk pathway. This mechanism, combined with enzyme depletion, broadens bistability, impacting cell fate decisions.

Area of Science:

  • Cellular signaling pathways
  • Molecular biology
  • Biochemistry

Background:

  • Mitogen-activated protein kinases (MAPKs) regulate critical cell fate processes like proliferation, differentiation, and apoptosis.
  • The Raf-Mek-Erk cascade often exhibits all-or-none responses, suggesting underlying bistable behavior.
  • Existing models attribute bistability to enzyme depletion in Erk phosphorylation cycles.

Purpose of the Study:

  • To identify and characterize novel regulatory mechanisms within the Raf-Mek-Erk signaling cascade.
  • To investigate the role of sequestration effects in generating pathway bistability.
  • To explore how this new mechanism synergizes with known mechanisms to influence signaling dynamics.

Main Methods:

  • Experimental observation of sequestration effects in the Raf-Mek-Erk cascade.

Related Experiment Videos

  • Mathematical modeling to demonstrate bistability arising from the proposed positive-feedback circuit.
  • Integration of sequestration feedback with enzyme depletion models.

    • Main Results:

    • A previously unrecognized positive-feedback mechanism involving Erk-mediated sequestration of Mek was identified.
    • This sequestration inhibits cascade activation under weak stimulation but amplifies signaling upon phosphorylation.
    • The positive feedback circuit generates bistability using experimentally measured parameters.
    • Synergy between sequestration feedback and enzyme depletion significantly expands the bistable range.

    Conclusions:

    • Sequestration effects, driven by stable docking interactions and competition, can create potent feedback loops in protein kinase cascades.
    • This sequestration-based feedback mechanism is a key contributor to the bistability of the Raf-Mek-Erk pathway.
    • The combined effects of sequestration and enzyme depletion provide a more comprehensive explanation for the observed bistable behavior and its impact on cell fate decisions.