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Chondronectin: physical and chemical properties.

H H Varner, H Furthmayr, B Nilsson

    Archives of Biochemistry and Biophysics
    |December 1, 1985
    PubMed
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    Chondronectin, a key factor for chondrocyte attachment, was purified and found to be a trimeric protein distinct from fibronectin and laminin. Its unique structure and properties are crucial for cell adhesion.

    Area of Science:

    • Biochemistry
    • Cell Biology
    • Proteomics

    Background:

    • Chondrocytes are specialized cells crucial for cartilage maintenance.
    • Cell attachment factors play vital roles in cell adhesion and tissue development.
    • Distinguishing between different extracellular matrix proteins is essential for understanding cellular behavior.

    Purpose of the Study:

    • To purify and characterize chondronectin, the chondrocyte attachment factor.
    • To determine the physical and chemical properties of chondronectin.
    • To compare chondronectin with other known attachment factors like fibronectin and laminin.

    Main Methods:

    • Protein purification from chicken serum.
    • Sedimentation equilibrium analysis to determine molecular weight.

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  • Electron microscopy with rotary shadowing for structural visualization.
  • Amino acid and carbohydrate composition analysis.
  • Enzymatic digestion assays to assess activity stability.

    • Main Results:

    • Chondronectin has a native molecular weight of 175,800 Da and a subunit molecular weight of 55,540 Da, indicating a trimeric structure.
    • Electron microscopy revealed a compact, globular protein structure.
    • The amino acid and carbohydrate profiles of chondronectin differ significantly from fibronectin and laminin.
    • Chondronectin's cell attachment activity is resistant to collagenase, elastase, and neuraminidase but sensitive to trypsin.

    Conclusions:

    • Chondronectin is a distinct protein with a trimeric structure.
    • Its biochemical composition and physical properties differentiate it from fibronectin and laminin.
    • These findings highlight chondronectin's unique role as a chondrocyte-specific attachment factor.