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Related Experiment Videos

Mapping of human apolipoprotein B antigenic determinants.

Y L Marcel, T L Innerarity, C Spilman

    Arteriosclerosis (Dallas, Tex.)
    |March 1, 1987
    PubMed
    Summary

    Mapping apolipoprotein B (apo B) epitopes reveals distinct regions. The N-terminal half of apo B-100 shares epitopes with apo B-48, while the C-terminal half contains the LDL receptor binding site, crucial for lipid interactions.

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    Area of Science:

    • Biochemistry
    • Immunology
    • Molecular Biology

    Background:

    • Apolipoprotein B (apo B) is a key component of lipoproteins, essential for lipid transport and metabolism.
    • Understanding the structural and functional domains of apo B is critical for deciphering its role in cardiovascular diseases.

    Purpose of the Study:

    • To map a minimum of 16 topographical epitopes on apolipoprotein B-100 (apo B-100) to study its conformation.
    • To identify regions of apo B-100 involved in lipid interactions and receptor binding.

    Main Methods:

    • Utilized monoclonal antibodies (Mabs) against low-density lipoprotein (LDL) apo B and delipidated/solubilized apo B.
    • Mapped epitopes to specific thrombolytic fragments (T4, T3, T2) of apo B-100.
    • Assessed the requirement of lipids for epitope expression.

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    Main Results:

    • Five epitopes on the N-terminal fragment T4 are shared with apo B-48 and do not require lipids.
    • Four epitopes on fragment T3 and some on T2 require lipids, with cholesteryl ester interaction noted for T3 epitopes near the C-terminus.
    • A cluster of epitopes near the T2/T3 cleavage site, dependent on cholesteryl esters, inhibits LDL binding and shows homology to apo E receptor binding domains.

    Conclusions:

    • The N-terminal half of apo B-100 exhibits immunochemical similarity to apo B-48.
    • The C-terminal half of apo B-100, near the T2/T3 cleavage site, contains the physiologically important apo B receptor binding domain, heavily influenced by lipid interactions.