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Related Experiment Videos

Ca2+ binding protects against gelsolin amyloidosis.

Lesley J Page1, Mary E Huff, Jeffery W Kelly

  • 1Department of Cell Biology, Institute for Childhood and Neglected Diseases, The Scripps Research Institute MB6, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA. ljpage@scripps.edu

Biochemical and Biophysical Research Communications
|September 1, 2004
PubMed
Summary

Familial amyloidosis of Finnish type (FAF) is caused by plasma gelsolin mutations that disrupt calcium binding, leading to protein misfolding and amyloid plaque formation. This research highlights calcium

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Neurodegenerative Diseases

Background:

  • Amyloid diseases involve polypeptide misfolding and extracellular aggregation.
  • Over 20 proteins are linked to amyloidosis, including amyloid-beta in Alzheimer's disease (AD).
  • Familial amyloidosis of Finnish type (FAF) is a specific amyloid disease.

Purpose of the Study:

  • To review the molecular mechanisms underlying familial amyloidosis of Finnish type (FAF).
  • To elucidate the role of plasma gelsolin mutations in FAF pathogenesis.
  • To understand the protective role of calcium (Ca2+) binding in preventing amyloid disease.

Main Methods:

  • Review of existing literature on FAF and plasma gelsolin.
  • Analysis of the structural and functional consequences of FAF-associated mutations.

Related Experiment Videos

  • Examination of proteolytic cleavage events in FAF pathogenesis.

    • Main Results:

    • FAF is caused by mutations in plasma gelsolin, affecting its Ca2+-binding domains.
    • Mutations lead to a loss of the Ca2+-binding site in domain 2, reducing protein stability.
    • This instability makes plasma gelsolin susceptible to furin protease cleavage, initiating amyloid formation.

    Conclusions:

    • Plasma gelsolin mutations disrupt Ca2+ binding, triggering a cascade of proteolytic events.
    • These events generate amyloidogenic peptides that self-assemble into plaques, characteristic of FAF.
    • Adequate Ca2+ binding in native plasma gelsolin is crucial for preventing amyloid disease.