Abstract
We investigated the relationship between PS1 and γ-secretase processing of amyloid precursor protein (APP) in primary cultures of neurons. Increasing the amount of APP at the cell surface or towards endosomes did not significantly affect PS1-dependent γ-secretase cleavage, although little PS1 is present in those subcellular compartments. In contrast, almost no γ-secretase processing was observed when holo-APP or APP-C99, a direct substrate for γ-secretase, were specifically retained in the endoplasmic reticulum (ER) by a double lysine retention motif. Nevertheless, APP-C99-dilysine (KK) colocalized with PS1 in the ER. In contrast, APP-C99 did not colocalize with PS1, but was efficiently processed by PS1-dependent γ-secretase. APP-C99 resides in a compartment that is negative for ER, intermediate compartment, and Golgi marker proteins. We conclude that γ-secretase cleavage of APP-C99 occurs in a specialized subcellular compartment where little or no PS1 is detected. This suggests that at least one other factor than PS1, located downstream of the ER, is required for the γ-cleavage of APP-C99. In agreement, we found that intracellular γ-secretase processing of APP-C99-KK both at the γ40 and the γ42 site could be restored partially after brefeldin A treatment. Our data confirm the “spatial paradox” and raise several questions regarding the PS1 is γ-secretase hypothesis.
Bibliography
Cupers, P., Bentahir, M., Craessaerts, K., Orlans, I., Vanderstichele, H., Saftig, P., De Strooper, B., & Annaert, W. (2001). The discrepancy between presenilin subcellular localization and γ-secretase processing of amyloid precursor protein. The Journal of Cell Biology, 154(4), 731â740.
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Dates
Type | When |
---|---|
Created | 23 years, 1 month ago (July 26, 2002, 12:46 p.m.) |
Deposited | 2 years ago (July 29, 2023, 12:30 a.m.) |
Indexed | 1 month, 1 week ago (July 14, 2025, 11:17 p.m.) |
Issued | 24 years ago (Aug. 13, 2001) |
Published | 24 years ago (Aug. 13, 2001) |
Published Online | 24 years ago (Aug. 13, 2001) |
Published Print | 24 years ago (Aug. 20, 2001) |
@article{Cupers_2001, title={The discrepancy between presenilin subcellular localization and γ-secretase processing of amyloid precursor protein}, volume={154}, ISSN={0021-9525}, url={http://dx.doi.org/10.1083/jcb.200104045}, DOI={10.1083/jcb.200104045}, number={4}, journal={The Journal of Cell Biology}, publisher={Rockefeller University Press}, author={Cupers, Philippe and Bentahir, Mustapha and Craessaerts, Katleen and Orlans, Isabelle and Vanderstichele, Hugo and Saftig, Paul and De Strooper, Bart and Annaert, Wim}, year={2001}, month=aug, pages={731–740} }