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Low-density lipoprotein receptor-related protein 8
Low-density lipoprotein receptor-related protein 8 (LRP8), also known as apolipoprotein E receptor 2 (ApoER2), is a protein that in humans is encoded by the ''LRP8'' gene. ApoER2 is a cell surface receptor that is part of the low-density lipoprotein receptor family. These receptors function in signal transduction and endocytosis of specific ligands. Through interactions with one of its ligands, reelin, ApoER2 plays an important role in embryonic neuronal migration and postnatal long-term potentiation. Another LDL family receptor, VLDLR, also interacts with reelin, and together these two receptors influence brain development and function. Decreased expression of ApoER2 is associated with certain neurological diseases.〔
==Structure==
ApoER2 is a protein made up of 870 amino acids. It is separated into a ligand binding domain of eight ligand binding regions, an EGF-like domain containing three cysteine-rich repeats, an O-linked glycosylation domain of 89 amino acids, a transmembrane domain of 24 amino acids, and a cytoplasmic domain of 115 amino acids, including an NPXY motif.
Each letter in the NPXY motif represents a certain amino acid where N is arginine, P is proline, X is any amino acid, and Y is tyrosine.
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