Amyloid precursor protein and its homologues: a family of proteolysis-dependent receptors |
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Authors: | Kristin T Jacobsen Kerstin Iverfeldt |
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Institution: | (1) Department of Neurochemistry, Stockholm University, 10691 Stockholm, Sweden |
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Abstract: | The Alzheimer’s amyloid precursor protein (APP) belongs to a conserved gene family that also includes the mammalian APLP1
and APLP2, the Drosophila APPL, and the C. elegans APL-1. The biological function of APP is still not fully clear. However, it is known that the APP family proteins have redundant
and partly overlapping functions, which demonstrates the importance of studying all APP family members to gain a more complete
picture. When APP was first cloned, it was speculated that it could function as a receptor. This theory has been further substantiated
by studies showing that APP and its homologues bind both extracellular ligands and intracellular adaptor proteins. The APP
family proteins undergo regulated intramembrane proteolysis (RIP), generating secreted and cytoplasmic fragments that have
been ascribed different functions. In this review, we will discuss the APP family with focus on biological functions, binding
partners, and regulated processing. |
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Keywords: | Alzheimer’ s disease Amyloid-β APP family APP intracellular domain Insulin-like growth factor Secretases Regulated intramembrane proteolysis |
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