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Quantifying Biomolecular Recognition with Site-Specific 2D Infrared Probes.

Philip J M Johnson1, Klemens L Koziol1, Peter Hamm1

  • 1Department of Chemistry, University of Zurich , Winterthurerstr. 190, 8057 Zurich, Switzerland.

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Summary

We developed a sensitive two-dimensional infrared spectrometer to study protein interactions. This method quantifies biomolecular recognition and binding energetics using unnatural amino acids like azidohomoalanine (Aha).

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Area of Science:

  • Biophysics
  • Spectroscopy
  • Protein Science

Background:

  • Azidohomoalanine (Aha) is an unnatural amino acid with an infrared-active azido group, useful for probing local protein structure.
  • Frequency shifts in the azido vibration provide insights into structural dynamics.

Purpose of the Study:

  • To develop a highly sensitive two-dimensional infrared (2DIR) spectrometer for protein structure analysis.
  • To quantify biomolecular recognition and binding energetics using Aha as a probe.

Main Methods:

  • Developed a 2DIR spectrometer with fast mechanical scanning and intrinsic phasing.
  • Achieved a sensitivity limit of approximately 100 μOD for sample analysis.
  • Applied the technique to study the interaction between a PDZ2 domain and Aha-mutated peptides.

Main Results:

  • The 2DIR spectrometer demonstrated high sensitivity for analyzing biomolecular interactions.
  • The method successfully quantified the biomolecular recognition between a PDZ2 domain and peptides.
  • Different binding modes were distinguished, and binding energetics were determined.

Conclusions:

  • The developed 2DIR spectrometer is a powerful tool for structural biology.
  • Aha serves as an effective probe for studying protein-ligand interactions.
  • This technique enables detailed characterization of biomolecular recognition events and their energetics.