Adaptor protein 2–mediated endocytosis of the β-secretase BACE1 is dispensable for amyloid precursor protein processing
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The β-site amyloid precursor protein (APP)–cleaving enzyme 1 (BACE1) is a transmembrane aspartyl protease that catalyzes the proteolytic processing of APP and other plasma membrane protein precursors. BACE1 cycles between the trans-Golgi network (TGN), the plasma membrane, and endosomes by virtue of signals contained within its cytosolic C-terminal domain. One of these signals is the DXXLL-motif sequence DISLL, which controls transport between the TGN and endosomes via interaction with GGA proteins. Here we show that the DISLL sequence is embedded within a longer [DE]XXXL[LI]-motif sequence, DDISLL, which mediates internalization from the plasma membrane by interaction with the clathrin-associated, heterotetrameric adaptor protein 2 (AP-2) complex. Mutation of this signal or knockdown of either AP-2 or clathrin decreases endosomal localization and increases plasma membrane localization of BACE1. Remarkably, internalization-defective BACE1 is able to cleave an APP mutant that itself cannot be delivered to endosomes. The drug brefeldin A reversibly prevents BACE1-catalyzed APP cleavage, ruling out that this reaction occurs in the endoplasmic reticulum (ER) or ER–Golgi intermediate compartment. Taken together, these observations support the notion that BACE1 is capable of cleaving APP in late compartments of the secretory pathway.
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D495 residue is essential for AP-2-mediated endocytosis of BACE1.
“A previous study analyzing the AP-2–mediated endocytosis of BACE1-mutated D495 in the acidic cluster motif (DDFAD495DISLL) in BACE1 to R495 showed that the D495 residue is essential for AP-2–mediated endocytosis of BACE1 (Prabhu et al., 2012).”
From Distinct anterograde trafficking pathways of BACE1 and amyloid precursor protein from the TGN and the regulation of amyloid-β production (2020) · cites this paper as Prabhu et al., 2012
The D495R mutation caused accumulation of D495R BACE1 mutant in the juxtanuclear region, suggesting the acidic D495 residue could also be important for post-Golgi trafficking of BACE1.
“an additional effect of the D495R mutation, which was not alluded to by these authors, was the accumulation of D495R BACE1 mutant in the juxtanuclear region of the cell (Prabhu et al., 2012), suggesting that the acidic D495 residue could also be important for the post-Golgi trafficking of BACE1.”
From Distinct anterograde trafficking pathways of BACE1 and amyloid precursor protein from the TGN and the regulation of amyloid-β production (2020) · cites this paper as Prabhu et al., 2012
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β-Secretase Activity Increases with Aging in Human, Monkey, and Mouse Brain
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- Authors
- Prabhu, Y., Burgos, P. V., Schindler, C., Farías, G. G., Magadán, J. G., & Bonifacino, J. S.
- Affiliations
- National Institutes of Health (US)
- Cell Biology and Metabolism Program, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892
- Corresponding author
- Bonifacino, Juan S.
- Venue
- Molecular Biology of the Cell
- Published
- 2012-06-15
- Volume
- 23
- Issue
- 12
- Pages
- 2339-2351
- ISSN
- 1059-1524 (ISSN-L)
- 1939-4586
- PMC
- PMC3374752
- OpenAlex
- W2099634214
- Cited by
- 68
- References
- 1
- Citations by year
- 2026: 1 · 2024: 3 · 2023: 2 · 2022: 6 · 2021: 5 · 2020: 4 · 2019: 7 · 2018: 4 · 2017: 4 · 2016: 6 · 2015: 7 · 2014: 10 · 2013: 6 · 2012: 2
- FWCI
- 3.53
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Licence
- cc-by-nc-sa
- Locations
- Molecular Biology of the Cell (publishedVersion)
- Europe PMC (PubMed Central) (publishedVersion, cc-by-nc-sa)
- PubMed Central (publishedVersion, cc-by-nc-sa)
- PubMed (publishedVersion)
- Americanae (AECID Library) (submittedVersion, other-oa)
- LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) (submittedVersion, other-oa)
- Funders
- National Institutes of Health
- Eunice Kennedy Shriver National Institute of Child Health and Human Development
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
- Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
- Health Sciences › Medicine › Physiology › Lysosomal Storage Disorders Research
- Keywords
- BACE1, APP processing, adaptor protein 2, clathrin-mediated endocytosis, trans-Golgi network, endosomal trafficking, APP cleavage, brefeldin A, secretory pathway
- MeSH terms
- Amino Acid Sequence, Cell Membrane, Clathrin, Endocytosis, Endoplasmic Reticulum, Golgi Apparatus, HeLa Cells, Humans, Microscopy, Fluorescence, Mutation, Protein Binding, Protein Synthesis Inhibitors, Endosomes, Immunoblotting, Aspartic Acid Endopeptidases, Amyloid beta-Protein Precursor, Brefeldin A, Two-Hybrid System Techniques, Amino Acid Motifs, Adaptor Protein Complex 2, RNA Interference, Cell Line, Tumor, Green Fluorescent Proteins, Amyloid Precursor Protein Secretases, Protein Multimerization, Proteolysis
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