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Peptide Identification Using Tandem Mass Spectrometry

Peptide Identification Using Tandem Mass Spectrometry

Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties.
This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...

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Updated: Sep 8, 2025

The Determination of Protease Specificity in Mouse Tissue Extracts by MALDI-TOF Mass Spectrometry: Manipulating PH to Cause Specificity Changes

The Determination of Protease Specificity in Mouse Tissue Extracts by MALDI-TOF Mass Spectrometry: Manipulating PH to Cause Specificity Changes

Published on: May 25, 2018

Protease Specificity Profiling Using Synthetic Combinatorial Peptide Libraries and Mass Spectrometry.

Bart Claushuis¹, Robert A Cordfunke², Arnoud H de Ru¹

¹Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden, The Netherlands.

Methods in Molecular Biology (Clifton, N.J.)

|July 15, 2025

Summary

This study developed a novel method using combinatorial peptide libraries to precisely map protease specificity. This technique aids in understanding protease function and discovering new therapeutic targets.

Keywords:

Bacterial adhesion LC-MS/MS Metalloprotease PPEP Pro-Pro endopeptidase Protease

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The Determination of Protease Specificity in Mouse Tissue Extracts by MALDI-TOF Mass Spectrometry: Manipulating PH to Cause Specificity Changes

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Resolving Affinity Purified Protein Complexes by Blue Native PAGE and Protein Correlation Profiling

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Published on: April 1, 2017

Area of Science:

Biochemistry
Proteomics
Enzymology

Background:

Protease function is dictated by substrate specificity, making its detailed profiling crucial for biological research.
High-throughput methods for characterizing protease specificity are essential for advancing protease studies.

Purpose of the Study:

To design and synthesize a combinatorial peptide library for detailed protease specificity profiling.
To demonstrate the utility of this library in conjunction with mass spectrometry for protease analysis.

Main Methods:

Utilized the one-bead-one-compound approach to create a diverse synthetic combinatorial peptide library.
Treated the library with Pro-Pro endopeptidase (PPEP) to identify cleavage sites.
Employed liquid chromatography-tandem mass spectrometry (LC-MS/MS) for high-throughput data acquisition and analysis.

Main Results:

Successfully synthesized a combinatorial peptide library suitable for protease substrate screening.
Demonstrated the capability of LC-MS/MS to identify specific cleavage patterns generated by PPEP.
Generated detailed substrate specificity data for PPEP using this novel approach.

Conclusions:

The combinatorial peptide library coupled with LC-MS/MS provides a powerful and detailed method for profiling protease specificity.
This approach offers significant advantages for protease research, enzyme characterization, and drug discovery.