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Related Experiment Videos

Avidin is a heparin-binding protein. Affinity, specificity and structural analysis.

Warren C Kett1, Ronald I W Osmond, Lily Moe

  • 1Molecular Immunology Laboratory, School of Biomedical Sciences, Curtin University of Technology, Level 5 MRF Building, Rear 50 Murray Street, Perth, Western Australia 6000, Australia.

Biochimica Et Biophysica Acta
|February 22, 2003
PubMed
Summary

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Avidin specifically binds heparin and heparan sulfate, but not other glycosaminoglycans. Fluorescent avidin derivatives can detect these molecules on surfaces, offering a valuable tool for biological research.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biotechnology

Background:

  • Glycosaminoglycans (GAGs) are crucial in various biological processes.
  • Avidin is known for its high affinity to biotin, but its interactions with other molecules are less understood.
  • Investigating avidin-GAG interactions can reveal new detection and binding mechanisms.

Purpose of the Study:

  • To characterize the specificity, affinity, and stoichiometry of avidin-glycosaminoglycan (GAG) interactions.
  • To explore the potential of avidin derivatives for detecting specific GAGs.

Main Methods:

  • Heparin-coated microtiter-plate assays.
  • Filter binding assays.
  • Surface Plasmon Resonance (SPR) analysis using a BIAcore 2000 biosensor.

Related Experiment Videos

  • pH-dependent binding studies.

    • Main Results:

    • Avidin demonstrated specific binding to heparin and heparan sulfate.
    • Chondroitin sulfates, dermatan sulfate, and hyaluronan did not compete for avidin binding.
    • Highest affinity was observed with heparin (overall affinity of 160 nM, with approximately two avidin molecules per heparin molecule).
    • Binding affinity was pH-dependent, increasing significantly at lower pH.
    • Fluorescent avidin derivatives successfully detected immobilized heparin and cell-surface heparan sulfate.

    Conclusions:

    • Avidin exhibits specific binding to particular GAG structures, primarily heparin and heparan sulfate.
    • The avidin-GAG interaction is influenced by pH and GAG structure.
    • Fluorescent avidin derivatives are effective tools for detecting heparin and heparan sulfate on various surfaces.