Cited by 127Proteoglycans and glycosaminoglycans researchOsteoarthritis Treatment and MechanismsProtease and Inhibitor Mechanisms

Alternative splicing in the aggrecan G3 domain influences binding interactions with tenascin-C and other extracellular matrix proteins.

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Day, Joanna M., Olin, Anders I., Murdoch, Alan D., Canfield, Ann, Sasaki, Takako, Timpl, Rupert, Hardingham, Timothy E., Aspberg, Anders·2004·Journal of Biological Chemistry

Abstract

The proteoglycans aggrecan, versican, neurocan, and brevican bind hyaluronan through their N-terminal G1 domains, and other extracellular matrix proteins through the C-type lectin repeat in their C-terminal G3 domains. Here we identify tenascin-C as a ligand for the lectins of all these proteoglycans and map the binding site on the tenascin molecule to fibronectin type III repeats, which corresponds to the proteoglycan lectin-binding site on tenascin-R. In the G3 domain, the C-type lectin is flanked by epidermal growth factor (EGF) repeats and a complement regulatory protein-like motif. In aggrecan, these are subject to alternative splicing. To investigate if these flanking modules affect the C-type lectin ligand interactions, we produced recombinant proteins corresponding to aggrecan G3 splice variants. The G3 variant proteins containing the C-type lectin showed different affinities for various ligands, including tenascin-C, tenascin-R, fibulin-1, and fibulin-2. The presence of an EGF motif enhanced the affinity of interaction, and in particular the splice variant containing both EGF motifs had significantly higher affinity for ligands, such as tenascin-R and fibulin-2. The mRNA for this splice variant was shown by reverse transcriptase-PCR to be expressed in human chondrocytes. Our findings suggest that alternative splicing in the aggrecan G3 domain may be a mechanism for modulating interactions and extracellular matrix assembly.

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Crossref · 10.1074/jbc.m400242200

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Authors
Day, J. M., Olin, A. I., Murdoch, A. D., Canfield, A., Sasaki, T., Timpl, R., Hardingham, T. E., & Aspberg, A.
Affiliations
  • Wellcome Centre for Cell-Matrix Research (GB)
  • Lund University (SE)
  • Max Planck Institute of Biochemistry (DE)
Corresponding author
Aspberg, Anders
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2004-03
Volume
279
Issue
13
Pages
12511-12518
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2157467821
Cited by
127
References
47
Citations by year
2026: 1 · 2025: 2 · 2024: 5 · 2023: 6 · 2022: 8 · 2021: 7 · 2020: 1 · 2019: 5 · 2018: 7 · 2017: 5 · 2016: 5 · 2015: 2 · 2014: 2 · 2013: 10 · 2012: 9
FWCI
2.83
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Research Explorer (The University of Manchester) (publishedVersion)
  • Max Planck Institute for Plasma Physics (submittedVersion)
  • Lund University Publications (Lund University) (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Proteoglycans and glycosaminoglycans research
  • Health Sciences › Medicine › Rheumatology › Osteoarthritis Treatment and Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Protease and Inhibitor Mechanisms
Keywords
aggrecan, alternative splicing, tenascin-C, tenascin-R, C-type lectin, EGF-like repeats, fibulin-1, fibulin-2, extracellular matrix assembly, chondrocytes, hyaluronan binding, fibronectin type III repeats
MeSH terms
Amino Acid Sequence, Base Sequence, Binding Sites, Binding, Competitive, Dose-Response Relationship, Drug, Electrophoresis, Polyacrylamide Gel, Epidermal Growth Factor, Extracellular Matrix, Fibronectins, Humans, Kinetics, Ligands, Molecular Sequence Data, Protein Binding, Proteoglycans, Recombinant Proteins, RNA, Messenger, Time Factors, Extracellular Matrix Proteins, Alternative Splicing, Protein Structure, Tertiary, Tenascin, Chondrocytes, Reverse Transcriptase Polymerase Chain Reaction, Surface Plasmon Resonance, Amino Acid Motifs, Lectins, Lectins, C-Type, Aggrecans

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