ApoA2 main distribution and function?

• A. Main distribution: HDL; Function: Structural
• B. Main distribution: CM; Function: Enzyme activator
• C. Main distribution: VLDL; Function: Receptor ligand
• D. Main distribution: LDL; Function: Structural

Answer: (A)

ApoA2 is a component of HDL particles, making it most abundant on HDL rather than on chylomicrons, VLDL, or LDL. Its role is mainly to stabilize the HDL particle, helping maintain its structure and potentially influencing particle size and metabolism. It is not known for activating enzymes or acting as a receptor ligand, which is why a structural role on HDL is the best fit. In short, ApoA2’s main distribution is HDL and its function is best described as structural/stabilizing for the HDL particle.