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Updated: Jul 6, 2025
10:49
Identification of Small Molecule-binding Proteins in a Native Cellular Environment by Live-cell Photoaffinity Labeling
Published on: September 20, 2016
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Enhanced mapping of small-molecule binding sites in cells
Jacob M Wozniak1, Weichao Li1, Paolo Governa2
1Department of Chemistry, The Scripps Research Institute, La Jolla, CA, USA.
Nature Chemical Biology
|January 3, 2024
Summary
This study introduces a new chemoproteomic method to precisely map where small molecules bind to proteins in cells using photoaffinity probes. This approach enhances protein-small molecule interaction analysis and drug discovery potential.
Area of Science:
- Chemical Biology
- Proteomics
- Drug Discovery
Background:
- Photoaffinity probes are essential for identifying protein-small molecule interactions.
- Precisely locating these binding sites within proteins remains a significant analytical challenge.
Purpose of the Study:
- To develop a chemoproteomic workflow for high-resolution mapping of protein binding sites for photoaffinity probes in cellular systems.
- To enable confident identification and characterization of small-molecule binding sites on endogenous proteins.
Main Methods:
- Developed a chemoproteomic workflow leveraging unique features of probe-modified peptides, including chimeric spectra.
- Created predictive models for confident determination of labeled amino acid sites.
- Integrated multiplexed quantitation for high-throughput analysis.
Main Results:
- Generated an extensive map of small-molecule binding sites across the proteome.
- Characterized diverse binding site characteristics using structural information.
- Provided direct evidence for the tractability of identified binding sites to small molecules.
Conclusions:
- The developed method offers a robust solution for analyzing photoaffinity probes with high resolution.
- Enables large-scale mapping of reversible small-molecule interactions in native biological systems.
- Advances understanding of protein-small molecule interactions for drug development.
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