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Related Experiment Videos

Evolutionary transition pathways for changing peptide ligand specificity and structure.

U Hoffmüller1, T Knaute, M Hahn

  • 1Institut für Medizinische Immunologie and Institut für Biochemie, Universitätsklinikum Charité, Humboldt-Universität zu Berlin, Schumannstrasse 20/21, 10098 Berlin, Germany.

The EMBO Journal
|September 16, 2000
PubMed
Summary
This summary is machine-generated.

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Researchers found evolutionary pathways allowing unrelated peptides to convert into each other while maintaining antibody binding. This study models how protein recognition evolves diverse structures and functions.

Area of Science:

  • Immunology
  • Molecular Biology
  • Evolutionary Biology

Background:

  • The hypervariable region of monoclonal antibody CB4-1 binds to anti-p24 (HIV-1) antibodies.
  • Three structurally distinct peptides (GATPEDLNQKL, GLYEWGGARI, FDKEWNLIEQN) bind to the same site on CB4-1.

Purpose of the Study:

  • To identify evolutionary pathways for peptide interconversion while maintaining antibody binding.
  • To understand how protein-protein recognition evolves diverse specificities and structures.

Main Methods:

  • Computational analysis of 7,620,480 potential peptide pathways.
  • Experimental testing of peptide binding to the anti-p24 antibody CB4-1.
  • Characterization of intermediate peptide binding modes using substitution analogs.

Related Experiment Videos

Main Results:

  • Identified pathways for converting between the three unrelated peptides in 9-10 single amino acid substitutions without losing antibody binding.
  • Observed accumulation of substitutions without altering key residue interactions.
  • Discovered a single amino acid exchange triggering a sudden shift in binding mode, specificity, and conformation.

Conclusions:

  • Demonstrated that evolutionary pathways allow for significant structural and functional divergence while maintaining binding affinity.
  • Proposed a model for the evolution of protein-protein recognition, highlighting the role of gradual changes punctuated by conformational shifts.