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Related Experiment Videos

Human BACE forms dimers and colocalizes with APP.

Ariane Schmechel1, Markus Strauss, Andrea Schlicksupp

  • 1Freie Universitaet Berlin, Institut fuer Chemie/Biochemie, Thielallee 63, Berlin D-14195, Germany.

The Journal of Biological Chemistry
|July 13, 2004
PubMed
Summary

Beta-site APP-cleaving enzyme (BACE) forms stable dimers in human brain tissue. This homodimerization is crucial for BACE

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biochemistry

Background:

  • Beta-site APP-cleaving enzyme (BACE) is a key protease in amyloid precursor protein (APP) processing.
  • The precise mechanisms linking BACE to gamma-secretase and APP processing remain unclear.

Purpose of the Study:

  • To investigate the molecular mechanisms and quaternary structure of BACE.
  • To understand how BACE interacts with APP and its role in amyloid beta-peptide generation.

Main Methods:

  • Analysis of BACE in human brain tissue.
  • Biochemical assays including salt, detergent, and reducing condition treatments.
  • Separation of BACE monomers and dimers under denaturing conditions.
  • Immunocytochemistry to study colocalization of BACE and APP in cells.

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Main Results:

  • BACE exists as a stable homodimer in human brain tissue, resistant to various biochemical treatments.
  • The soluble ectodomain of BACE is monomeric and shows reduced inhibitor avidity.
  • BACE and APP colocalize in the plasma membrane, and BACE activity persists even with an active site mutation, suggesting a dimeric function.

Conclusions:

  • BACE homodimerization is a stable structural feature.
  • Dimerization may be essential for BACE's substrate association and catalytic activity in APP processing.
  • This finding offers new insights into the regulation of amyloidogenic pathways.