Sannerud, R;
Esselens, C;
Ejsmont, P;
Mattera, R;
Rochin, L;
Tharkeshwar, AK;
De Baets, G;
... Annaert, W; + view all
(2016)
Restricted Location of PSEN2/γ-Secretase Determines Substrate Specificity and Generates an Intracellular Aβ Pool.
Cell
, 166
(1)
pp. 193-208.
10.1016/j.cell.2016.05.020.
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Abstract
γ-Secretases are a family of intramembrane-cleaving proteases involved in various signaling pathways and diseases, including Alzheimer’s disease (AD). Cells co-express differing γ-secretase complexes, including two homologous presenilins (PSENs). We examined the significance of this heterogeneity and identified a unique motif in PSEN2 that directs this γ-secretase to late endosomes/lysosomes via a phosphorylation-dependent interaction with the AP-1 adaptor complex. Accordingly, PSEN2 selectively cleaves late endosomal/lysosomal localized substrates and generates the prominent pool of intracellular Aβ that contains longer Aβ; familial AD (FAD)-associated mutations in PSEN2 increased the levels of longer Aβ further. Moreover, a subset of FAD mutants in PSEN1, normally more broadly distributed in the cell, phenocopies PSEN2 and shifts its localization to late endosomes/lysosomes. Thus, localization of γ-secretases determines substrate specificity, while FAD-causing mutations strongly enhance accumulation of aggregation-prone Aβ42 in intracellular acidic compartments. The findings reveal potentially important roles for specific intracellular, localized reactions contributing to AD pathogenesis.
| Type: | Article |
|---|---|
| Title: | Restricted Location of PSEN2/γ-Secretase Determines Substrate Specificity and Generates an Intracellular Aβ Pool |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.cell.2016.05.020 |
| Publisher version: | http://dx.doi.org/10.1016/j.cell.2016.05.020 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Cell Biology, gamma-secretase activity, lysosomal membrane-proteins, alzheimers-disease, endosomal dysfunction, amyloid accumulation, force-field, localization, presenilins, mutations, mechanism |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UK Dementia Research Institute HQ |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1542124 |
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