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A Detergent-Free Grinding Sample Preparation Method Dramatically Enhances PELSA for Mapping Integral Membrane
Ting Yu1,2, Yan Wang1, Yanan Li1
1State Key Laboratory of Medical Proteomics, CAS Key Laboratory of Separation Sciences for Analytical Chemistry, National Chromatographic R&A Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CAS), Dalian 116023, China.
Analytical Chemistry
|October 27, 2025
Summary
A new detergent-free method, DFG-PELSA, preserves integral membrane protein (IMP) structures for accurate ligand binding studies. This proteomic approach enhances drug discovery by identifying IMP targets and their binding sites effectively.
Area of Science:
- Biochemistry
- Proteomics
- Drug Discovery
Background:
- Conventional integral membrane protein (IMP) extraction using detergents disrupts native conformations, hindering ligand target identification.
- A need exists for reliable, unbiased, detergent-free proteomic methods to sensitively identify ligand-binding IMPs.
Purpose of the Study:
- To develop an innovative, detergent-free workflow for proteome-wide identification of ligand-binding IMPs and their binding regions.
- To enhance the identification of IMP targets and facilitate structure-based drug discovery.
Main Methods:
- Developed DFG-PELSA (Detergent-Free Grinding sample preparation method coupled with Peptide-centric Local Stability Assay).
- Integrated mechanical grinding, extensive trypsinization, and DIA mass spectrometry.
- Applied the method to HeLa cells for proteome-wide analysis.
Main Results:
- Successfully recovered over 1000 transmembrane proteins while maintaining native conformations.
- Mapped AMP-PNP interactions with IMPs (SERCA2, ABCB6) and identified binding regions.
- Revealed on-target and off-target mechanisms of EGFR tyrosine kinase inhibitors (EGFR-TKIs).
- Identified stability shifts from cardiotonic steroid binding to ATP1A1 transmembrane regions.
Conclusions:
- DFG-PELSA offers a unique capability for studying ligand-IMP interactions without disrupting protein structure.
- The method provides a valuable platform for structure-based drug discovery, target validation, and understanding drug mechanisms.
