Abstract
The γ-secretase complex is required for intramembrane cleavage of several integral membrane proteins, including the Notch receptor, where it generates an active signaling fragment. Four putative γ-secretase components have been identified—presenilin (Psn), nicastrin (Nct), Aph-1, and Pen-2. Here, we use a stepwise coexpression approach to investigate the role of each new component in γ-secretase assembly and activation. Coexpression of all four proteins leads to high level accumulation of mature Psn and increased proteolysis of Notch. Aph-1 and Nct may form a subcomplex that stabilizes the Psn holoprotein at an early step in γ-secretase assembly. Subcomplex levels of Aph-1 are down-regulated by stepwise addition of Psn, suggesting that Aph-1 might not enter the mature complex. In contrast, Pen-2 accumulates proportionally with Psn, and is associated with Psn endoproteolysis during γ-secretase assembly. These results demonstrate that Aph-1 and Pen-2 are essential cofactors for Psn, but that they play different roles in γ-secretase assembly and activation.
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Dates
Type | When |
---|---|
Created | 22 years, 3 months ago (May 27, 2003, 1:45 p.m.) |
Deposited | 2 years, 1 month ago (July 22, 2023, 10:15 a.m.) |
Indexed | 1 year ago (Aug. 5, 2024, 4:33 a.m.) |
Issued | 22 years, 3 months ago (May 26, 2003) |
Published | 22 years, 3 months ago (May 26, 2003) |
Published Online | 22 years, 3 months ago (May 27, 2003) |
Published Print | 22 years, 3 months ago (May 26, 2003) |
@article{Hu_2003, title={Different cofactor activities in γ-secretase assembly}, volume={161}, ISSN={0021-9525}, url={http://dx.doi.org/10.1083/jcb.200304014}, DOI={10.1083/jcb.200304014}, number={4}, journal={The Journal of Cell Biology}, publisher={Rockefeller University Press}, author={Hu, Yue and Fortini, Mark E.}, year={2003}, month=may, pages={685–690} }