Cited by 85Lipid metabolism and disordersLipid metabolism and biosynthesisLymphatic Disorders and Treatments

The acidic domain of GPIHBP1 is important for the binding of lipoprotein lipase and chylomicrons.

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Gin, Peter, Yin, Liya, Davies, Brandon S.J., Weinstein, Michael M., Ryan, Robert O., Bensadoun, André, Fong, Loren G., Young, Stephen G. +1 more·2008·Journal of Biological Chemistry

Abstract

GPIHBP1, a glycosylphosphatidylinositol-anchored endothelial cell protein of the lymphocyte antigen 6 (Ly6) family, plays a key role in the lipolysis of triglyceride-rich lipoproteins (e.g. chylomicrons). GPIHBP1 is expressed along the luminal surface of endothelial cells of heart, skeletal muscle, and adipose tissue, and GPIHBP1-expressing cells bind lipoprotein lipase (LPL) and chylomicrons avidly. GPIHBP1 contains an amino-terminal acidic domain (amino acids 24-48) that is enriched in aspartate and glutamate residues, and we previously speculated that this domain might be important in binding ligands. To explore the functional importance of the acidic domain, we tested the ability of polyaspartate or polyglutamate peptides to block the binding of ligands to pgsA-745 Chinese hamster ovary cells that overexpress GPIHBP1. Both polyaspartate and polyglutamate blocked LPL and chylomicron binding to GPIHBP1. Also, a rabbit antiserum against the acidic domain of GPIHBP1 blocked LPL and chylomicron binding to GPIHBP1-expressing cells. Replacing the acidic amino acids within GPIHBP1 residues 38-48 with alanine eliminated the ability of GPIHBP1 to bind LPL and chylomicrons. Finally, mutation of the positively charged heparin-binding domains within LPL and apolipoprotein AV abolished the ability of these proteins to bind to GPIHBP1. These studies indicate that the acidic domain of GPIHBP1 is important and that electrostatic interactions play a key role in ligand binding.

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Crossref · 10.1074/jbc.m802579200

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  • Defective lipolysis occurs with genetic defects in LpL; defects in apoC-II; defective association of LpL with the vascular wall due to antibodies to heparin or defects in GPIHBP1; or defective intracellular LpL processing due to mutated lipase maturation factor 1.

    “Defective lipolysis occurs with genetic defects in LpL; defects in apoC-II; defective association of LpL with the vascular wall due to antibodies to heparin or defects in glycosylphosphatidylinositol-anchored high-density lipoprotein-binding protein 1, an LpL-binding protein (75, 76); or defective intracellular LpL processing due to mutated lipase maturation factor 1 (77).”

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Authors
Gin, P., Yin, L., Davies, B. S. J., Weinstein, M. M., Ryan, R. O., Bensadoun, A., Fong, L. G., Young, S. G., & Beigneux, A. P.
Affiliations
  • University of California, Los Angeles (US)
  • Cornell University (US)
Corresponding author
Beigneux, Anne P.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2008-10
Volume
283
Issue
43
Pages
29554-29562
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1976037677
Cited by
85
References
27
Citations by year
2026: 1 · 2025: 4 · 2024: 2 · 2023: 5 · 2022: 3 · 2021: 2 · 2020: 1 · 2019: 3 · 2018: 4 · 2017: 5 · 2016: 11 · 2015: 3 · 2014: 7 · 2013: 4 · 2012: 6
FWCI
5.84
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Heart, Lung, and Blood Institute (HL073061, R01HL087228, HL-66600, R01HL073061, HL-66621, U01HL066621, U01HL066600)
Topics
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Lipid metabolism and disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Lipid metabolism and biosynthesis
  • Health Sciences › Medicine › Surgery › Lymphatic Disorders and Treatments
Keywords
GPIHBP1, acidic domain, lipoprotein lipase, chylomicrons, ligand binding, electrostatic interactions, polyaspartate, poly-γ-glutamic acid, heparin-binding domain, triglyceride-rich lipoproteins, lipolysis, endothelial cells, GPI-anchored proteins
MeSH terms
Animals, Carrier Proteins, Chylomicrons, Cricetulus, Cricetinae, Humans, Hydrogen-Ion Concentration, Ligands, Lipoprotein Lipase, Peptides, Polyglutamic Acid, Protein Binding, CHO Cells, Protein Structure, Tertiary, Receptors, Lipoprotein, Mice

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