SP3-PELSA: A rapid and sensitive approach for studying protein-ligand interaction with small-amount samples

Area of Science:

• Biochemistry
• Proteomics
• Drug Discovery

Background:

• Understanding protein-ligand interactions is crucial for biological pathway elucidation and pharmaceutical development.
• The peptide-centric local stability assay (PELSA) is a high-performing method for studying these interactions.
• Conventional PELSA methods suffer from low peptide yields and long processing times due to filter-based recovery, especially with limited samples.

Purpose of the Study:

• To develop an optimized PELSA method with improved efficiency and peptide recovery.
• To address the limitations of conventional PELSA, particularly concerning processing time and yield.
• To enhance the utility of PELSA for drug target discovery, especially with scarce biological material.

Main Methods:

• Developed SP3-PELSA by integrating the Single-Pot, Solid-Phase-enhanced Sample Preparation (SP3) method for peptide recovery.
• Systematically optimized protein precipitation and trypsin inactivation conditions, identifying 1% formic acid and 80% acetonitrile as optimal.
• Conducted comparative analyses between SP3-PELSA and conventional PELSA.

Main Results:

• SP3-PELSA reduced processing time fivefold compared to conventional PELSA.
• SP3-PELSA significantly increased peptide recovery rates, with notable improvements for hydrophobic peptides.
• SP3-PELSA demonstrated superior performance in identifying established drug targets compared to other mainstream approaches.

Conclusions:

• SP3-PELSA offers a highly efficient and faster alternative to conventional PELSA for peptide recovery.
• The method's high recovery efficiency and automation potential make it suitable for large-scale drug target discovery, particularly with limited clinical samples.
• SP3-PELSA is a powerful tool for analyzing hydrophobic proteins and advancing drug screening.