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Updated: Jun 26, 2026

Evaluation of Protein–Protein Interactions using an On-Membrane Digestion Technique

Evaluation of Protein–Protein Interactions using an On-Membrane Digestion Technique

Published on: July 19, 2019

Optimized Digestion Conditions for Membrane Protein Footprinting and Mass Spectrometry Analysis.

Ming Cheng^1,2, Xinzhu Li³, Lin Bai¹

¹Shandong Laboratory of Yantai Drug Discovery, Bohai Rim Advanced Research Institute for Drug Discovery, Yantai 264117, China.

|June 25, 2026

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This study presents a new digestion protocol for integral membrane proteins (IMPs), enhancing structural mass spectrometry. The optimized method achieves high sequence coverage, crucial for understanding these vital drug targets.

Area of Science:

Biochemistry
Proteomics
Structural Biology

Background:

Integral membrane proteins (IMPs) are crucial drug targets but challenging for proteomics due to hydrophobicity.
Conventional methods struggle with IMPs, limiting structural proteomics efforts.
Existing IMP proteomics often prioritizes identification over detailed structural analysis.

Purpose of the Study:

To develop and evaluate a tailored digestion protocol for structural mass spectrometry of IMPs.
To optimize conditions for efficient detergent removal and peptide generation for IMP analysis.
To enable reliable bottom-up structural characterization of IMPs.

Main Methods:

Developed a novel digestion protocol for integral membrane proteins (IMPs).
Utilized filter-aided sample preparation (FASP) for efficient detergent removal.

Keywords:

filter-aided sample preparation (FASP)mass spectrometry membrane protein membrane protein digestion protein footprinting vitamin K epoxide reductase (VKOR)

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Last Updated: Jun 26, 2026

Evaluation of Protein–Protein Interactions using an On-Membrane Digestion Technique

Evaluation of Protein–Protein Interactions using an On-Membrane Digestion Technique

Published on: July 19, 2019

Characterizing Cellular Proteins with In-cell Fast Photochemical Oxidation of Proteins

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Published on: March 11, 2020

An Optimized Quantitative Pull-Down Analysis of RNA-Binding Proteins Using Short Biotinylated RNA

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Published on: February 17, 2023

Evaluated protease-additive combinations and MS retention time calibration.

Main Results:

Achieved >90% sequence coverage for an amphipathic IMP model.
Identified optimal conditions for detecting transmembrane peptides.
Demonstrated that detergent removal and protease selection are key, not cleavable surfactants.

Conclusions:

The developed protocol provides a practical framework for IMP structural mass spectrometry.
Optimized digestion is critical for reliable bottom-up structural analysis of IMPs.
This method facilitates the characterization of IMPs, improving drug target understanding.