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Identity and function of gamma-secretase
W Taylor Kimberly1, Michael S Wolfe
1Center for Neurologic Diseases, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115, USA.
Journal of Neuroscience Research
|November 5, 2003
Summary
Gamma-secretase, an enzyme crucial for Alzheimer's disease and development, has been identified. The protease complex consists of four proteins: presenilin, nicastrin, aph-1, and pen-2.
Area of Science:
- Biochemistry
- Neuroscience
- Molecular Biology
Background:
- Gamma-secretase performs intramembrane proteolysis of key proteins like amyloid-beta precursor protein and Notch receptor.
- Its role in Alzheimer's disease pathogenesis and normal development is significant, yet the protease remained elusive until recently.
Purpose of the Study:
- To identify the components of the gamma-secretase complex.
- To understand the functional reconstitution and signaling capabilities of the identified complex.
Main Methods:
- Proteomic analysis to identify components of the gamma-secretase complex.
- Biochemical assays to confirm the catalytic activity and function of the reconstituted complex.
Main Results:
- Identification of four essential membrane proteins: presenilin, nicastrin, aph-1, and pen-2, as components of the gamma-secretase complex.
- Demonstration that these four proteins are sufficient to reconstitute the active gamma-secretase complex.
- Evidence that the reconstituted complex mediates cell surface signaling via intramembrane proteolysis of various receptors.
Conclusions:
- The four-protein complex (presenilin, nicastrin, aph-1, pen-2) constitutes the active gamma-secretase.
- This complex is responsible for the intramembrane proteolysis of critical substrates, impacting cellular signaling and disease pathways.