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Human serum low density lipoprotein-sodium deoxycholate interaction.

J Q Oeswein, P W Chun

    The Journal of Biological Chemistry
    |March 25, 1983
    PubMed
    Summary
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    Sodium deoxycholate rapidly binds to low-density lipoprotein (LDL), altering its structure. This binding increases LDL particle radius and causes elongation or distortion.

    Area of Science:

    • Biochemistry
    • Lipid Metabolism
    • Molecular Interactions

    Background:

    • Low-density lipoprotein (LDL) plays a crucial role in cholesterol transport.
    • Understanding LDL's interaction with bile acids like sodium deoxycholate is vital for lipid metabolism research.
    • Sodium deoxycholate is a bile salt that can affect lipoprotein structure and function.

    Purpose of the Study:

    • To investigate the kinetics and structural consequences of sodium deoxycholate binding to LDL.
    • To quantify the binding affinity and rate of sodium deoxycholate-LDL interaction.
    • To determine how sodium deoxycholate affects LDL particle dimensions.

    Main Methods:

    • Kinetic analysis of sodium deoxycholate binding to LDL.
    • Measurement of particle radius and axial ratio using biophysical techniques.

    Related Experiment Videos

  • Varying sodium deoxycholate concentrations to assess dose-dependent effects.

    • Main Results:

    • Sodium deoxycholate binding to LDL is a rapid process with a bimolecular rate constant of approximately 539 M-1 S-1.
    • At 1 mM sodium deoxycholate, 0.04 g of bile salt bound per g of LDL.
    • LDL particle radius increased from 102 Å to 128 Å, with an axial ratio of 5.6, indicating elongation or distortion.

    Conclusions:

    • The binding of sodium deoxycholate to LDL is a fast initial reaction.
    • Sodium deoxycholate binding induces significant structural changes in LDL particles, including increased radius and elongation.
    • These findings provide insights into the molecular mechanisms of bile acid-lipoprotein interactions.