Apolipoprotein D is a protein that in humans is encoded by the APODgene. Unlike other lipoproteins, which are mainly produced in the liver, apolipoprotein D is mainly produced in the brain and testes.
Apolipoprotein D (Apo-D) is a component of high-density lipoprotein that has no marked similarity to other apolipoprotein sequences. It has a high degree of homology to plasma retinol-binding protein and other members of the alpha 2 microglobulin protein superfamily of carrier proteins, also known as lipocalins. It is a glycoprotein of estimated molecular weight 33 KDa. Apo-D is closely associated with the enzyme lecithin:cholesterol acyltransferase - an enzyme involved in lipoprotein metabolism. ApoD has also been shown to be an important link in the transient interaction between HDL and LDL particles and between HDL particles and cells.
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