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Related Experiment Videos

Nicastrin binds to membrane-tethered Notch.

F Chen1, G Yu, S Arawaka

  • 1Centre for Research in Neurodegenerative Diseases; Departments of Medicine and Medical Biophysics, University of Toronto, Tanz Neuroscience Building, 6 Queen's Park Crescent West, Toronto, Ontario M5S 3H2, Canada.

Nature Cell Biology
|August 3, 2001
PubMed
Summary

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Nicastrin, a protein complex component, processes both beta-amyloid precursor protein (betaAPP) and Notch signaling pathways. Mutations in nicastrin affect betaAPP cleavage more than Notch cleavage, indicating differential roles.

Area of Science:

  • Molecular Biology
  • Neuroscience
  • Cell Biology

Background:

  • Presenilins and nicastrin form complexes crucial for cleaving beta-amyloid precursor protein (betaAPP) and Notch.
  • Gamma-secretase cleavage of betaAPP generates amyloid beta-peptide (Abeta), linked to Alzheimer's disease pathogenesis.
  • S3-site cleavage of Notch generates Notch intracellular domain (NICD), vital for intercellular signaling.

Purpose of the Study:

  • To investigate the role of nicastrin in Notch processing and compare it to its role in betaAPP processing.
  • To determine if mutations in a specific nicastrin domain differentially affect gamma-secretase and S3-site cleavage.
  • To assess potential competition between the Notch and betaAPP pathways.

Main Methods:

  • Investigated nicastrin binding to membrane-tethered Notch.

Related Experiment Videos

  • Analyzed the effects of mutations in the conserved 312-369 domain of nicastrin on gamma-secretase and S3-site cleavage.
  • Assessed pathway competition between Notch and betaAPP.

    • Main Results:

    • Nicastrin binds to membrane-tethered Notch, similar to its interaction with betaAPP substrates.
    • Mutations in the nicastrin 312-369 domain strongly modulated gamma-secretase activity but only weakly affected S3-site Notch cleavage.
    • No significant competition was observed between the Notch and betaAPP processing pathways.

    Conclusions:

    • Nicastrin plays a conserved role in processing both Notch and betaAPP, but its 312-369 domain exhibits differential effects on these activities.
    • The findings suggest distinct regulatory mechanisms or substrate specificities within the gamma-secretase complex concerning Notch and betaAPP.
    • The lack of pathway competition implies independent regulation or capacity of these crucial cellular signaling and processing routes.