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Related Concept Videos

Proteomics01:33

Proteomics

A proteome is the entire set of proteins that a cell type produces. We can study proteomes using the knowledge of genomes because genes code for mRNAs, and the mRNAs encode proteins. Although mRNA analysis is a step in the right direction, not all mRNAs are translated into proteins.
Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term proteomics...
Peptide Identification Using Tandem Mass Spectrometry01:33

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...
MALDI-TOF Mass Spectrometry01:19

MALDI-TOF Mass Spectrometry

Mass spectrometry is a powerful characterization technique that can identify and separate a wide variety of compounds ranging from chemical to biological entities, based on their mass-to-charge ratio (m/z). The instruments that allow this detection, known as mass spectrometers, have three components: an ion source, a mass analyzer, and a detector. These spectrometers differ based on the nature of their ion source and analyzers.Matrix-assisted laser desorption ionization (MALDI) is a commonly...

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Related Experiment Video

Updated: May 12, 2026

Quantitative Proteomics Workflow using Multiple Reaction Monitoring Based Detection of Proteins from Human Brain Tissue
11:49

Quantitative Proteomics Workflow using Multiple Reaction Monitoring Based Detection of Proteins from Human Brain Tissue

Published on: August 28, 2021

Limited Proteolysis Mass Spectrometry to Identify Protein Structural Differences in Brain Tissue.

Haley E Tarbox1, Stephen D Fried1,2

  • 1Department of Chemistry, Johns Hopkins University, Baltimore, MD, USA.

Bio-Protocol
|May 11, 2026
PubMed
Summary

This study details a Limited Proteolysis Mass Spectrometry (LiP-MS) protocol to identify protein structural changes in brain tissue. The method uses proteinase K and free software for proteome-wide analysis.

Keywords:
BrainFLiPPRFragPipeLimited proteolysis mass spectrometryStructural proteomics

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Matrix-assisted Laser Desorption/Ionization Time of Flight (MALDI-TOF) Mass Spectrometric Analysis of Intact Proteins Larger than 100 kDa
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Biochemical Purification and Proteomic Characterization of Amyloid Fibril Cores from the Brain

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Area of Science:

  • Proteomics
  • Structural Biology
  • Biochemistry

Background:

  • Structural proteomics enables the study of protein structural differences between conditions.
  • Limited proteolysis mass spectrometry (LiP-MS) uses protease cleavage to report on protein structure.
  • Previous LiP-MS implementations require specific protocols for proteome-wide analysis.

Purpose of the Study:

  • To present a detailed protocol for a Limited Proteolysis Mass Spectrometry (LiP-MS) workflow.
  • To enable the identification of proteome-wide protein structural changes between two experimental conditions.
  • To provide a reliable and accessible method for structural proteomics research.

Main Methods:

  • The protocol involves homogenizing tissue under native conditions, followed by limited proteolysis with proteinase K (PK).
  • Samples are prepared for mass spectrometry (MS) and analyzed using data-dependent acquisition (DDA) or data-independent acquisition (DIA).
  • Data processing utilizes FragPipe and FragPipe Limited-Proteolysis Processor (FLiPPR), including permutation analyses for reliability.

Main Results:

  • The protocol successfully identifies proteins exhibiting structural changes between different experimental conditions in a proteome-wide manner.
  • The workflow is applicable to brain tissue, providing insights into condition-specific structural alterations.
  • Key features include the use of free and open-source software (FragPipe and FLiPPR).

Conclusions:

  • This LiP-MS protocol offers a robust method for investigating proteome-wide protein structural changes.
  • The described workflow is efficient, with sample preparation achievable in two days.
  • The protocol facilitates reliable structural proteomics studies using accessible tools.