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a nonlipid protein portion occurring in plasma lipoproteins; there are five families of apolipoproteins, grouped into four classes according to function, A, B, C, and E (the former apolipoprotein D has now been placed in class A). Apolipoproteins play a role in the transport of lipoproteins.
The protein component of any lipoprotein complexes that is a normal constituent of plasma chylomicrons, HDL, LDL, and VLDL in humans.
apolipoprotein(ăp′ə-lĭp′ō-prō′tēn′, -tē-ĭn, -lī′pō-)
Any of various proteins that bind to insoluble lipids to form the soluble lipoproteins, such as HDL and LDL, that transport triglycerides and cholesterol within the body.
apolipoproteinAny of a family of small proteins on the surface of lipoprotein complexes, which bind to specific enzymes or transport proteins across cell membranes, which correspond to the protein moiety of lipoproteins. See HDL-cholesterol, Kringle domain.
The protein component of lipoprotein complexes that is a normal constituent of plasma chylomicrons, high-density lipoproteins, low-density lipoproteins, and very-low-density lipoproteins in humans.