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Related Experiment Videos

Multiple aggregation factors in cartilage proteoglycan.

J D Gregory

    The Biochemical Journal
    |June 1, 1973
    PubMed
    Summary
    This summary is machine-generated.

    Bovine nasal proteoglycans aggregate via essential linking factors. These factors enable proteoglycan subunit aggregation even after chondroitinase digestion, highlighting their crucial role in cartilage structure.

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    Area of Science:

    • Biochemistry
    • Biomaterials Science

    Background:

    • Proteoglycans are key components of cartilage extracellular matrix.
    • Bovine nasal septa provide a rich source of proteoglycans for research.

    Purpose of the Study:

    • To investigate the role of linking factors in proteoglycan aggregation.
    • To determine if chondroitinase digestion affects proteoglycan aggregation in the presence of linking factors.

    Main Methods:

    • Isolation and purification of proteoglycans from bovine nasal septa.
    • Separation of proteoglycan subunits and linking factors using CsCl density gradient centrifugation.
    • Enzymatic digestion of purified proteoglycan subunits with chondroitinase.

    Main Results:

    • Proteoglycans from bovine nasal septa exist as partially aggregated complexes containing linking factors.

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  • Two essential linking factors were identified and separated from proteoglycan subunits.
  • Chondroitinase digestion of proteoglycan subunits did not prevent aggregation when linking factors were present.

    • Conclusions:

    • Linking factors are essential for the aggregation of proteoglycan subunits.
    • The aggregation mechanism mediated by linking factors is independent of the glycosaminoglycan chains susceptible to chondroitinase digestion.