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Related Experiment Videos

Binders based on dimerised immunoglobulin VH domains.

Jorge Sepúlveda1, Hulin Jin, Daniele Sblattero

  • 1International Centre for Genetic Engineering and Biotechnology, Molecular Immunology, Area Science Park, Padriciano 99, 34012 Trieste, Italy.

Journal of Molecular Biology
|October 8, 2003
PubMed
Summary
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Researchers discovered that variable heavy (VH) domains can spontaneously form stable dimers (VH dimers) with antigen-binding capabilities. These VH dimers, when engineered into antibody formats, show significantly higher binding affinity than traditional variable light/heavy chain pairs.

Area of Science:

  • Immunology
  • Protein Engineering
  • Biochemistry

Background:

  • Antibody-antigen binding relies on variable light (VL) and variable heavy (VH) chain association.
  • VL domains can dimerize, and VH domains share structural similarities, suggesting potential for VH dimerization.

Purpose of the Study:

  • To investigate the spontaneous formation and antigen-binding capacity of VH dimers (VHD).
  • To explore the potential of VHD as novel antigen-binding molecules.
  • To engineer VHD into various antibody formats for enhanced binding.

Main Methods:

  • Demonstrated spontaneous formation of stable VH dimers (VHD).
  • Displayed VHD on filamentous phages for antigen-specific binder selection.
  • Expressed VHD in bacterial and mammalian cells in multiple formats (single-chain, double-chain, IgG analogues).

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Main Results:

  • Spontaneous VHD formation was permissive and yielded stable, antigen-specific molecules.
  • VHD were efficiently expressed and secreted in various formats.
  • A VH dimer in an IgG analogue format achieved ~30 nM affinity for a glutenin subunit, 20x higher than VL/VH counterparts.

Conclusions:

  • VH dimers represent a novel class of stable, antigen-binding molecules.
  • Engineered VHD can achieve high binding affinities, surpassing traditional antibody formats.
  • VHD offer a promising alternative for developing novel therapeutics and diagnostic tools.