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Degenerate interfaces in antigen-antibody complexes.

K Decanniere1, T R Transue, A Desmyter

  • 1Vrije Universiteit Brussel Dienst Ultrastructuur, Vlaams Instituut voor Biotechnologie, Paardenstraat 65, B-1640 St.-Genesius Rode, Belgium. klaas@ultr.vub.ac.be

Journal of Molecular Biology
|October 26, 2001
PubMed
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High-affinity antibody-antigen complexes can exhibit degenerate interfaces. Different crystal structures reveal varying orientations and interface characteristics for the same antibody-protein complex.

Area of Science:

  • Structural biology
  • Immunology
  • Biochemistry

Background:

  • Protein-protein interactions are crucial in biological systems.
  • Analysis of protein interfaces often relies on single X-ray structures, assuming an optimal complex.
  • Antibody-antigen complexes are vital for immune responses and therapeutic applications.

Purpose of the Study:

  • To investigate the structural variability of protein-protein interfaces in a high-affinity antibody-antigen system.
  • To determine if the interface characteristics are consistent across different crystal forms and independent complexes.
  • To challenge the assumption of a single, optimal structure for antibody-antigen interactions.

Main Methods:

  • X-ray crystallography was used to obtain multiple structures of the camel variable domain antibody fragment (cAb-Lys3) and hen egg white lysozyme complex.

Related Experiment Videos

  • Analysis of the asymmetric units in different crystal forms revealed multiple independent complexes.
  • Comparative analysis of the relative orientations and interface residues between antibody and antigen in these distinct complexes.

    • Main Results:

    • Two independent cAb-Lys3-lysozyme complexes in one crystal form showed different relative orientations and interface features.
    • A third complex in a different crystal form exhibited yet another distinct orientation.
    • Significant variations in protein-protein interface characteristics were observed within the same high-affinity antibody-antigen system.

    Conclusions:

    • The study demonstrates that protein-protein interfaces, even in high-affinity complexes, can be degenerate and structurally variable.
    • The assumption of a single, optimal interface based on one structure may be insufficient for understanding antibody-antigen interactions.
    • Structural variability should be considered when defining general characteristics of protein-protein interfaces.