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Related Experiment Videos

Directing phage selections towards specific epitopes

H L Parsons1, J C Earnshaw, J Wilton

  • 1Cambridge Antibody Technology, Melbourn, UK.

Protein Engineering
|November 1, 1996
PubMed
Summary
This summary is machine-generated.

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Competitive deselection using phage display enabled the isolation of specific antibodies targeting unique epitopes on foetal haemoglobin (HbF). This method successfully identified lower-affinity antibodies with high specificity, overcoming cross-reactivity issues with adult haemoglobin (HbA).

Area of Science:

  • Biochemistry
  • Immunology
  • Molecular Biology

Background:

  • Phage display is a powerful technique for selecting antibodies from large repertoires.
  • Antibody selection can be complicated by cross-reactivity with related antigens.
  • Identifying antibodies with specificities for unique epitopes is crucial for diagnostic and therapeutic applications.

Purpose of the Study:

  • To develop a method for directing phage display selections towards unique epitopes on protein antigens.
  • To isolate antibodies with high specificity for foetal haemoglobin (HbF) by overcoming cross-reactivity with adult haemoglobin (HbA).

Main Methods:

  • A phage display library of human single-chain variable fragments (scFvs) was screened against HbF.
  • Competitive deselection was employed by preincubating the library with HbA to prevent binding of cross-reactive antibodies.

Related Experiment Videos

  • Selected clones were characterized for binding affinity and specificity using immunocytochemistry and flow cytometry.

    • Main Results:

    • Initial panning yielded a dominant cross-reactive antibody (Kd 10 nM) and 17 others that bound both HbF and HbA.
    • Competitive deselection identified four clones with preferential binding to HbF.
    • One clone (Hb-1) exhibited exquisite specificity for HbF (Kd 6 microM) and could differentiate HbF-expressing cells from HbA-expressing cells.

    Conclusions:

    • Competitive deselection is an effective strategy for isolating specific antibodies against unique epitopes.
    • This method allows for the selection of lower-affinity antibodies with valuable specificities from phage display repertoires.
    • The identified HbF-specific antibody serves as a potential tool for research and development, possibly as a lead for affinity maturation.