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The discrepancy between presenilin subcellular localization and γ-secretase processing of amyloid precursor protein

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Cupers, Philippe, Bentahir, Mustapha, Craessaerts, Katleen, Orlans, Isabelle, Vanderstichele, Hugo, Saftig, Paul, De Strooper, Bart, Annaert, Wim·2001·The Journal of Cell Biology

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.

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Metadata

Authors
Cupers, P., Bentahir, M., Craessaerts, K., Orlans, I., Vanderstichele, H., Saftig, P., De Strooper, B., & Annaert, W.
Venue
The Journal of Cell Biology
Published
2001-08-13
Volume
154
Issue
4
Pages
731-740
ISSN
  • 0021-9525 (ISSN-L)
  • 1540-8140
OpenAlex
W2005017513
Cited by
158
References
5
FWCI
12.53
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: The discrepancy between presenilin subcellular localization and γ-secretase processing of amyloid precursor protein. https://app.cochat.ai/papers/10.1083/jcb.200104045
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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. https://doi.org/10.1083/jcb.200104045

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