Abstract
Mutations in the presenilin genes are associated with early onset familial Alzheimer's disease and lead to increased accumulation of βA4 peptide, the proteolytic product of the amyloid precursor protein (APP). To test whether presenilins interfere with APP metabolism, presenilin-2 (PS2) was coexpressed with APP in mammalian cells. Analysis of PS2 immunoprecipitates revealed that a fraction of APP was associated with the PS2 immunocomplexes. This non-covalent association was specific for the APP family of proteins and restricted to immature forms, occuring probably during transit through the endoplasmic reticulum. Additionally, coexpression with PS2 resulted in a decrease of APP secretion, suggesting a direct participation of presenilins in the intracellular sorting, trafficking and processing of APP molecules.
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Weidemann, A., Paliga, K., Dürrwang, U. et al. Formation of stable complexes between two Alzheimer's disease gene products: Presenilin-2 and β-amyloid precursor protein. Nat Med 3, 328–332 (1997). https://doi.org/10.1038/nm0397-328
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DOI: https://doi.org/10.1038/nm0397-328
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