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Time-Resolved Acetaldehyde-Based Accessibility Profiling Maps Ligand-Target Interactions.

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Summary
This summary is machine-generated.

A new acetaldehyde (AcH) labeling method complements formaldehyde (FH) for studying ligand-protein interactions. This approach precisely maps binding sites and affinities using proteomics, mass spectrometry, and molecular docking, even within cell lysates.

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AcH labelingligand screeningligand−protein interactionsproteomicstarget

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Area of Science:

  • Biochemistry and Proteomics
  • Chemical Biology

Background:

  • Understanding ligand-protein interactions is crucial for deciphering cellular biochemical processes.
  • Formaldehyde (FH)-based labeling has been used to identify ligand-target interaction sites by detecting reduced reagent accessibility.
  • FH labeling, while rapid, can present challenges in reaction cleanliness and specificity.

Purpose of the Study:

  • To introduce and validate an acetaldehyde (AcH)-based lysine accessibility profiling method as a complementary tool to FH labeling for studying ligand-target interactions.
  • To demonstrate the utility of AcH labeling in identifying and characterizing ligand-binding sites and affinities on proteins.
  • To showcase the application of this method in complex biological samples like cell lysates.

Main Methods:

  • Acetaldehyde (AcH) labeling of proteins to assess lysine accessibility at a moderate reaction rate.
  • Quantitative proteomics, including multiple reaction monitoring (MRM), to analyze time-dependent changes in lysine accessibility upon ligand binding.
  • Native mass spectrometry (MS) and molecular docking for validation of binding sites and affinities.

Main Results:

  • AcH labeling provides a cleaner reaction profile compared to FH labeling, enabling precise identification of lysine residues involved in ligand binding.
  • Time-resolved abundance changes of peptides quantified by MRM effectively determine ligand-binding sites and differentiate binding affinities.
  • The method successfully identified ligand-binding sites by monitoring chemical accessibility of responsive peptides in cell lysates.

Conclusions:

  • The combined use of AcH-based lysine accessibility profiling, native MS, and MRM screening offers a powerful and versatile toolbox for characterizing ligand-target interactions.
  • This approach enables detailed mapping of binding topography and interrogation of binding affinities.
  • The method holds significant promise for future applications in complex cellular environments and drug discovery.