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Related Experiment Videos

Uncovering gamma-secretase.

Harald Steiner1

  • 1Adolf-Butenandt-Institute, Department of Biochemistry, Laboratory for Alzheimer's and Parkinson's Disease Research, Schillerstrasse 44, Ludwig-Maximilians-University, 80336 Munich, Germany. hsteiner@med.uni-muenchen.de

Current Alzheimer Research
|June 25, 2005
PubMed
Summary

Researchers have identified the protein complex responsible for generating amyloid beta-peptide (Abeta), a key factor in Alzheimer's disease (AD) neurodegeneration. This discovery completes the identification of genes involved in Abeta production from its precursor.

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Amyloid β, γ-secretase, and familial Alzheimer's disease.

The Lancet. Neurology·2024

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biochemistry

Background:

  • Amyloid beta-peptide (Abeta) accumulation in the brain is a primary driver of neurodegeneration in Alzheimer's disease (AD).
  • Abeta is produced from the beta-amyloid precursor protein (APP) via sequential enzymatic cleavage by beta-secretase and gamma-secretase.

Purpose of the Study:

  • To identify the elusive gamma-secretase complex, responsible for the final intramembrane cleavage of APP.
  • To elucidate the complete genetic and molecular machinery involved in Abeta generation.

Main Methods:

  • Genetic studies provided initial clues to the components of gamma-secretase.
  • Biochemical reconstitution studies were employed to confirm the enzyme's composition and function.

Main Results:

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  • The gamma-secretase complex has been identified as a multi-protein assembly comprising presenilin (PS), nicastrin (NCT), APH-1, and PEN-2.
  • Presenilin (PS) contains the active site and represents a novel class of aspartyl proteases.
  • The other components are essential for complex assembly, stability, and maturation, with NCT potentially involved in substrate recognition.

Conclusions:

  • The complete set of genes required for Abeta generation from APP has now been identified.
  • This breakthrough provides a comprehensive understanding of the molecular basis of Abeta production in Alzheimer's disease.
  • Presenilin (PS) functions as the catalytic core of gamma-secretase, offering potential therapeutic targets.