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Antigenic similarities among biotin-binding proteins

N Subramanian1, S Subramanian, P R Adiga

  • 1Department of Biochemistry, Indian Institute of Science, Bangalore, India.

Biochemistry and Molecular Biology International
|November 1, 1996
PubMed
Summary

Immunological cross-reactivities among biotin-binding proteins like avidin, streptavidin, and biotin-binding protein-II (BBP-II) were investigated. Common antigenic determinants were found, with antibodies inhibiting biotin binding to these proteins.

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Area of Science:

  • Biochemistry
  • Immunology
  • Molecular Biology

Background:

  • Avidin, streptavidin, and biotin-binding protein-II (BBP-II) are high-affinity biotin-binding proteins.
  • Understanding their immunological relationships is crucial for various biochemical and diagnostic applications.

Purpose of the Study:

  • To investigate the immunological cross-reactivities among avidin, streptavidin, and BBP-II.
  • To identify shared antigenic determinants within this family of biotin-binding proteins.

Main Methods:

  • Western blot analysis using polyclonal antisera against avidin, streptavidin, and BBP-II.
  • Liquid phase radioimmunoassay to assess binding inhibition and ligand displacement.

Main Results:

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  • Varying degrees of immunological cross-reactivity were observed between the biotin-binding proteins, dependent on the specific antisera used.
  • Evidence for common antigenic determinants shared by all three proteins was identified.
  • Antibodies against these shared epitopes dose-dependently inhibited [3H]biotin binding and displaced bound biotin from all tested proteins.

    • Conclusions:

    • The biotin-binding proteins (avidin, streptavidin, BBP-II) share common antigenic determinants.
    • These findings have implications for the development of specific antibodies and assays involving these proteins.