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Cartilage oligomeric matrix protein forms protein complexes with synovial lubricin via non-covalent and covalent interactions

Journal article
Authors Sarah A. Flowers
S. Kalamajski
Lena Björkman
A. Aspberg
Niclas G. Karlsson
C Jin
Published in Osteoarthritis and Cartilage
Volume 25
Issue 9
Pages 1496-1504
ISSN 1063-4584
Publication year 2017
Published at Institute of Medicine, Department of Rheumatology and Inflammation Research
Institute of Biomedicine, Department of Medical Biochemistry and Cell Biology
Pages 1496-1504
Language en
Links doi.org/10.1016/j.joca.2017.03.016
Keywords Boundary lubrication, Cartilage degradation, Proteomics, O-linked glycoproteins, Lubricin, Cartilage oligomeric matrix protein, quiescin-sulfhydryl oxidase, superficial zone protein, articular-cartilage, rheumatoid-arthritis, recombinant lubricin, crystal-structure, collagen, comp, osteoarthritis, identification, Orthopedics, Rheumatology
Subject categories Clinical Medicine

Abstract

Objective: Understanding the cartilage surface structure, lost in arthritic disease, is essential for developing strategies to effectively restore it. Given that adherence of the lubricating protein, lubricin, to the cartilage surface is critical for boundary lubrication, an interaction with cartilage oligomeric matrix protein (COMP) was investigated. COMP, an abundant cartilage protein, is known to be important for matrix formation. Design: Synovial fluid (SF) from arthritic patients was used to detect possible COMP-lubricin complexes by immunological methods. Recombinant (RC) COMP and lubricin fragments were expressed to characterize this bonding and mass spectrometry employed to specifically identify the cysteines involved in inter-protein disulfide bonds. Results: COMP-lubricin complexes were identified in the SF of arthritic patients by Western blot, co-immunoprecipitation and sandwich ELISA. RC fragment solid-phase binding assays showed that the C-terminal (amino acids (AA) 518-757) of COMP bound non-covalently to the N-terminal of lubricin (AA 105-202). Mass spectrometry determined that although cysteines throughout COMP were involved in binding with lubricin, the cysteines in lubricin were primarily focused to an N-terminal region (AA 64-86). The close proximity of the non-covalent and disulfide binding domains on lubricin suggest a two-step mechanism to strongly bind lubricin to COMP. Conclusion: These data demonstrate that lubricin forms a complex network with COMP involving both non-covalent and covalent bonds. This complex between lubricin and the cartilage protein COMP can be identified in the SF of patients with arthritis conditions including osteoarthritis (OA) and rheumatoid arthritis (RA). (C) 2017 Osteoarthritis Research Society International. Published by Elsevier Ltd. All rights reserved.

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