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LDL receptor
The Low-Density Lipoprotein (LDL) Receptor is a mosaic protein of 839 amino acids (after removal of 21-amino acid signal peptide) that mediates the endocytosis of cholesterol-rich LDL. It is a cell-surface receptor that recognizes the apoprotein B100, which is embedded in the outer phospholipid layer of LDL particles. The receptor also recognizes the apoE protein found in chylomicron remnants and VLDL remnants (IDL). In humans, the LDL receptor protein is encoded by the ''LDLR'' gene. It belongs to the Low density lipoprotein receptor gene family.
Michael S. Brown and Joseph L. Goldstein were awarded the 1985 Nobel Prize in Physiology or Medicine for their identification of the Low Density Lipoprotein (LDL) Receptor and its relation to cholesterol metabolism and familial hypercholesterolemia.
==Clinical significance==
LDL is directly involved in the development of atherosclerosis, due to accumulation of LDL-cholesterol in the blood. Atherosclerosis is the process responsible for the majority of cardiovascular diseases.
Hyperthyroidism may be associated with hypocholesterolaemia via upregulation of the LDL receptor, and hypothyroidism with the converse
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