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Amyloid Precursor Protein

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2 papers 0 to 25 followers
https://www.readbyqxmd.com/read/26433932/app-overexpression-in-the-absence-of-npc1-exacerbates-metabolism-of-amyloidogenic-proteins-of-alzheimer-s-disease
#1
Mahua Maulik, Kyle Peake, JiYun Chung, Yanlin Wang, Jean E Vance, Satyabrata Kar
Amyloid-β (Aβ) peptides originating from β-amyloid precursor protein (APP) are critical in Alzheimer's disease (AD). Cellular cholesterol levels/distribution can regulate production and clearance of Aβ peptides, albeit with contradictory outcomes. To better understand the relationship between cholesterol homeostasis and APP/Aβ metabolism, we have recently generated a bigenic ANPC mouse line overexpressing mutant human APP in the absence of Niemann-Pick type C-1 protein required for intracellular cholesterol transport...
December 15, 2015: Human Molecular Genetics
https://www.readbyqxmd.com/read/26403946/homodimerization-protects-the-amyloid-precursor-protein-c99-fragment-from-cleavage-by-%C3%AE-secretase
#2
Edith Winkler, Ayse Julius, Harald Steiner, Dieter Langosch
The amyloid precursor protein (APP) is a single-span integral membrane protein whose C-terminal fragment C99 is cleaved within the transmembrane helix by γ-secretase. Cleavage produces various Aβ peptides that are linked to the etiology of Alzheimer's disease. The transmembrane helix is known to homodimerize in a sequence-specific manner, and considerable controversy about whether the homodimeric form of C99 is cleaved by γ-secretase exists. Here, we generated various covalent C99 homodimers via cross-linking at engineered cysteine residues...
October 13, 2015: Biochemistry
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