ApoA-1 is a component of which lipoprotein?

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Multiple Choice

ApoA-1 is a component of which lipoprotein?

ApoA-1 is the major apolipoprotein of HDL, giving this lipoprotein its identity and driving its key role in reverse cholesterol transport. It acts as the structural scaffold for HDL particles and activates the enzyme LCAT (lecithin–cholesterol acyltransferase), which esterifies cholesterol on HDL. This esterification allows HDL to mature from discoidal to spherical particles and to carry cholesterol away from peripheral tissues back to the liver. Other lipoproteins are built around different apolipoproteins: LDL and VLDL primarily contain ApoB-100 (and some ApoE in certain subsets), while chylomicrons contain ApoB-48. ApoA-1 is not the main protein of these lipoproteins, so HDL is the correct association.

ApoA-1 is the major apolipoprotein of HDL, giving this lipoprotein its identity and driving its key role in reverse cholesterol transport. It acts as the structural scaffold for HDL particles and activates the enzyme LCAT (lecithin–cholesterol acyltransferase), which esterifies cholesterol on HDL. This esterification allows HDL to mature from discoidal to spherical particles and to carry cholesterol away from peripheral tissues back to the liver.

Other lipoproteins are built around different apolipoproteins: LDL and VLDL primarily contain ApoB-100 (and some ApoE in certain subsets), while chylomicrons contain ApoB-48. ApoA-1 is not the main protein of these lipoproteins, so HDL is the correct association.

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