Cited by 113Proteoglycans and glycosaminoglycans researchAlzheimer's disease research and treatmentsCholesterol and Lipid Metabolism

New Insights into the Heparan Sulfate Proteoglycan-binding Activity of Apolipoprotein E

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Libeu, Clare Peters, Lund-Katz, Sissel, Phillips, Michael C., Wehrli, Suzanne, Hernáiz, Maria J., Capila, Ishan, Linhardt, Robert J., Raffaı̈, Robert L. +3 more·2001·Journal of Biological Chemistry

Abstract

Defective binding of apolipoprotein E (apoE) to heparan sulfate proteoglycans (HSPGs) is associated with increased risk of atherosclerosis due to inefficient clearance of lipoprotein remnants by the liver. The interaction of apoE with HSPGs has also been implicated in the pathogenesis of Alzheimer's disease and may play a role in neuronal repair. To identify which residues in the heparin-binding site of apoE and which structural elements of heparan sulfate interact, we used a variety of approaches, including glycosaminoglycan specificity assays, (13)C nuclear magnetic resonance, and heparin affinity chromatography. The formation of the high affinity complex required Arg-142, Lys-143, Arg-145, Lys-146, and Arg-147 from apoE and N- and 6-O-sulfo groups of the glucosamine units from the heparin fragment. As shown by molecular modeling, using a high affinity binding octasaccharide fragment of heparin, these findings are consistent with a binding mode in which five saccharide residues of fully sulfated heparan sulfate lie in a shallow groove of the alpha-helix that contains the HSPG-binding site (helix 4 of the four-helix bundle of the 22-kDa fragment). This groove is lined with residues Arg-136, Ser-139, His-140, Arg-142, Lys-143, Arg-145, Lys-146, and Arg-147. In the model, all of these residues make direct contact with either the 2-O-sulfo groups of the iduronic acid monosaccharides or the N- and 6-O-sulfo groups of the glucosamine sulfate monosaccharides. This model indicates that apoE has an HSPG-binding site highly complementary to heparan sulfate rich in N- and O-sulfo groups such as that found in the liver and the brain.

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Crossref · 10.1074/jbc.m104746200

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Authors
Libeu, C. P., Lund-Katz, S., Phillips, M. C., Wehrli, S., Hernáiz, M. J., Capila, I., Linhardt, R. J., Raffaı̈, R. L., Newhouse, Y. M., Zhou, F., & Weisgraber, K. H.
Affiliations
  • Gladstone Institutes (US)
  • Children's Hospital of Philadelphia (US)
  • University of Iowa (US)
  • Texas A&M University (US)
Corresponding author
Weisgraber, Karl H.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2001-10
Volume
276
Issue
42
Pages
39138-39144
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2106771721
Cited by
113
References
61
Citations by year
2026: 5 · 2025: 12 · 2024: 2 · 2023: 8 · 2022: 4 · 2021: 3 · 2020: 3 · 2019: 5 · 2018: 2 · 2017: 3 · 2016: 3 · 2015: 2 · 2014: 5 · 2013: 2 · 2012: 2
FWCI
2.04
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • National Heart, Lung, and Blood Institute (HL-41633, P01HL041633, R01HL056083, HL-56083, HL 52622, R01HL052622)
  • National Institute of General Medical Sciences (GM38060, R01GM038060)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Proteoglycans and glycosaminoglycans research
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
Keywords
apolipoprotein E, heparan sulfate proteoglycans, heparin-binding site, iduronic acid, glucosamine sulfate, atherosclerosis, Alzheimer's disease, lipoprotein clearance, binding site modeling
MeSH terms
Animals, Apolipoproteins E, Arginine, Binding Sites, Brain, Cattle, Chromatography, Affinity, Dose-Response Relationship, Drug, Glucosamine, Heparin, Humans, Hydrogen-Ion Concentration, Kinetics, Liver, Lysine, Models, Molecular, Mutation, Magnetic Resonance Spectroscopy, Polysaccharides, Protein Binding, Serine, Time Factors, Streptavidin, Heparan Sulfate Proteoglycans, Biotinylation, Surface Plasmon Resonance

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