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Adult human articular cartilage contains a hyaluronic acid-binding protein of Mr 60 000-75 000, which contains disulphide bonds essential for this interaction. The molecule can compete with proteoglycan subunits for binding sites on hyaluronic acid, and can also displace proteoglycan subunits from hyaluronic acid if their interaction is not stabilized by the presence of link proteins. The abundance of this protein in the adult accounts for the reported inability to prepare high-buoyant-density proteoglycan aggregates from extracts of adult human cartilage [Roughley, White, Poole &amp; Mort (1984) Biochem. J. 221, 637-644], whereas the deficiency of the protein in newborn human cartilage allows the normal recovery of proteoglycan aggregates from this tissue. The protein shares many common features with a hyaluronic acid-binding region derived by proteolytic treatment of a proteoglycan aggregate preparation, and this may also represent its origin in the cartilage, with its production increasing during tissue maturation.

biochemical journal

Identification of a hyaluronic acid-binding protein that interferes with the preparation of high-buoyant-density proteoglycan aggregates from adult human articular cartilage