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Related Experiment Videos

Lipoprotein lipase domain function

H Wong1, R C Davis, T Thuren

  • 1Lipid Research Laboratory, Veterans Administration Wadsworth Medical Center, Los Angeles, California 90073.

The Journal of Biological Chemistry
|April 8, 1994
PubMed
Summary
This summary is machine-generated.

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Human lipoprotein lipase (LPL) has two domains. The NH2-terminal domain is catalytic, while the COOH-terminal domain aids lipolysis and substrate interaction, distinct from heparin binding.

Area of Science:

  • Biochemistry
  • Enzymology
  • Molecular Biology

Background:

  • Human lipoprotein lipase (LPL) is crucial for lipid metabolism, existing as a monomer with two distinct functional domains.
  • The NH2-terminal domain contains catalytic residues, and the COOH-terminal domain influences substrate specificity and heparin binding.
  • Understanding domain-specific functions is key to elucidating LPL's role in lipolysis.

Purpose of the Study:

  • To investigate the catalytic role of serine 132 in the NH2-terminal domain of LPL.
  • To determine the function of the COOH-terminal domain in LPL's lipolytic activity and heparin binding.
  • To propose a functional model for the two LPL domains.

Main Methods:

  • Site-directed mutagenesis of the putative active-site serine (S132) in LPL.

Related Experiment Videos

  • Transient expression of wild-type and mutant LPL in COS-7 cells.
  • Purification and activity assays (lipase, esterase) of mutant LPL.
  • Monoclonal antibody-based functional analysis of the COOH-terminal domain, including lipolytic, esterolytic, and heparin binding assays.

    • Main Results:

    • Mutagenesis of serine 132 to alanine, cysteine, or glycine abolished all enzymatic activity, confirming its catalytic role.
    • S132A mutant LPL retained comparable lipid monolayer binding, indicating serine 132 is not essential for lipid interaction.
    • Monoclonal antibody inhibition of the COOH-terminal domain reduced lipolytic activity but minimally affected esterolytic activity.
    • Heparin binding affinity remained unchanged after COOH-terminal domain antibody reaction, suggesting distinct functional sites.

    Conclusions:

    • Serine 132 is essential for the catalytic function of human LPL, not for lipid binding.
    • The COOH-terminal domain is critical for LPL's lipolytic function, likely by facilitating interaction with insoluble lipid substrates.
    • The heparin-binding site is spatially separate from the COOH-terminal functional region involved in lipolysis.