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GGA1 acts as a spatial switch altering amyloid precursor protein trafficking and processing.

Christine A F von Arnim¹, Robert Spoelgen, Ithan D Peltan

¹Alzheimer Disease Research Laboratory, Massachusetts General Hospital, Harvard Medical School, Charlestown, Massachusetts 02129, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience

|September 29, 2006

Summary

Golgi-localized gamma-ear-containing ARF-binding (GGA) protein 1 (GGA1) influences Alzheimer's disease (AD) protein processing. GGA1 confines amyloid precursor protein (APP) in the Golgi, reducing amyloid-beta (Abeta) production by preventing gamma-secretase cleavage.

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Area of Science:

Molecular Biology
Cell Biology
Neuroscience

Background:

Alzheimer's disease (AD) is characterized by amyloid plaques formed by beta-amyloid (Abeta) peptides.
Amyloid precursor protein (APP) processing involves sequential cleavage by beta-site of APP-cleaving enzyme (BACE) and gamma-secretase.
GGA1, a Golgi-associated protein, interacts with BACE and affects its localization.

Purpose of the Study:

To investigate the role of GGA1 in APP processing and Abeta production.
To determine how GGA1 influences the subcellular localization and interactions of APP and BACE.
To elucidate the mechanism by which GGA1 affects APP cleavage and Abeta generation.

Main Methods:

Overexpression of GGA1 in cellular models.
Analysis of APP C-terminal fragments and Abeta levels.
Fluorescence resonance energy transfer (FRET) to assess protein proximity.
Assessment of Notch intracellular domain release.

Main Results:

GGA1 overexpression increased APP beta-cleavage products but reduced mature Abeta.
GGA1 sequestered APP within the Golgi apparatus, promoting proximity with BACE.
GGA1 specifically inhibited gamma-secretase cleavage of APP, not Notch.
GGA1's GAT domain integrity was crucial, but direct binding to BACE was not required.

Conclusions:

GGA1 acts as a spatial regulator, influencing APP trafficking and processing within the Golgi.
GGA1 prevents APP beta-cleavage products from accessing gamma-secretase, thereby reducing Abeta formation.
The interaction between APP and GGA1 has potential pathophysiological relevance in Alzheimer's disease development.