Abstract
Mutations in the presenilin-1 (PS1) gene are associated with Alzheimer’s disease and cause increased secretion of the neurotoxic amyloid-β peptide (Aβ). Critical intramembraneous aspartates at residues 257 and 385 are required for the function of PS1 protein. Here we investigate the biological function of a naturally occurring PS1 splice variant (PS1 Δexon 8), which lacks the critical aspartate 257. Cell lines that stably express PS1 Δexon 8 or a PS1 protein in which aspartate residue 257 is mutated secrete significant levels of Aβ, whereas Aβ generation is severely reduced in cells transfected with PS1 containing a mutation of aspartate 385. In contrast, endoproteolytic processing of Notch is almost completely inhibited in cell lines expressing any of the PS1 variants that lack one of the critical aspartates. These data indicate that PS1 may differentially facilitate γ-secretase-mediated generation of Aβ and endoproteolysis of Notch.
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Acknowledgements
This work was supported by a grant from the Deutsche Forschungsgemeinschaft (HA 1737/6-1) and the Boehringer Ingelheim K.G. We thank R. Kopan for the Notch cDNA construct, D. J. Selkoe for the PS1(D257A) cDNA, E. Koo for the monoclonal antibodies to β-APP, H-P. Hauri for the anti-giantin antibody, and P. Kahle for helpful discussions.
Correspondence and requests for materials should be addressed to C.H.
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Capell, A., Steiner, H., Romig, H. et al. Presenilin-1 differentially facilitates endoproteolysis of the β-amyloid precursor protein and Notch. Nat Cell Biol 2, 205–211 (2000). https://doi.org/10.1038/35008626
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DOI: https://doi.org/10.1038/35008626
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