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Related Concept Videos

Protein Networks02:26

Protein Networks

An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...
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...
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...
Mass Spectrum: Interpretation01:24

Mass Spectrum: Interpretation

An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a soft-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.To...

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Related Experiment Video

Updated: May 24, 2026

Resolving Affinity Purified Protein Complexes by Blue Native PAGE and Protein Correlation Profiling
09:35

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

Published on: April 1, 2017

Protein identification by spectral networks analysis.

Nuno Bandeira1

  • 1Center for Computational Mass Spectrometry, University of California, San Diego, La Jolla, CA, USA. bandeira@ucsd.edu

Methods in Molecular Biology (Clifton, N.J.)
|November 18, 2010
PubMed
Summary
This summary is machine-generated.

By aligning tandem mass spectrometry (MS/MS) spectra, researchers can identify peptide modifications and improve de novo sequencing accuracy. This novel approach, Shotgun Protein Sequencing, enhances protein identification and analysis of unknown proteins.

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Laser Microdissection-Based Protocol for the LC-MS/MS Analysis of the Proteomic Profile of Neuromelanin Granules
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Last Updated: May 24, 2026

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Laser Microdissection-Based Protocol for the LC-MS/MS Analysis of the Proteomic Profile of Neuromelanin Granules

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Area of Science:

  • Proteomics
  • Mass Spectrometry
  • Bioinformatics

Background:

  • Tandem mass spectrometry (MS/MS) generates vast amounts of spectral data.
  • Current peptide identification algorithms analyze spectra individually, limiting information extraction.
  • Redundancy exists within high-throughput MS/MS datasets from related peptides.

Purpose of the Study:

  • To develop a novel method for peptide identification by leveraging spectral redundancy.
  • To improve the accuracy of identifying modified and unmodified peptide variants.
  • To enhance de novo sequencing accuracy and protein sequence recovery.

Main Methods:

  • Alignment of unidentified MS/MS spectra from related peptides.
  • Iterative alignment for grouping multiple peptide modification variants.
  • Integration of shotgun proteomics with spectral alignment for Shotgun Protein Sequencing.

Main Results:

  • Demonstrated alignment of MS/MS spectra for identifying modified and unmodified peptide variants.
  • Achieved high de novo sequencing accuracy through MS/MS spectra assembly.
  • Recovered nearly complete protein sequences using Shotgun Protein Sequencing.

Conclusions:

  • Aligning MS/MS spectra overcomes limitations of analyzing spectra in isolation.
  • Shotgun Protein Sequencing offers a powerful new approach for de novo protein sequencing.
  • This method has the potential to revolutionize the study of unknown proteins.