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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...

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Related Experiment Video

Updated: Jun 22, 2026

Synthesis and Structure Determination of &#181;-Conotoxin PIIIA Isomers with Different Disulfide Connectivities
11:44

Synthesis and Structure Determination of µ-Conotoxin PIIIA Isomers with Different Disulfide Connectivities

Published on: October 2, 2018

Assignment of disulfide-linked peptides using automatic a1 ion recognition.

Sheng Yu Huang1, Chien Hsien Wen, Ding Tzai Li

  • 1Life Science Business Unit and Computer Integrated Manufacturing Business Unit, C Sun MFG. LTD., 7F.-9, No.79, Sec. 1, Sintai Fifth Road, Sijhih City, Taipei County 221, Taiwan. cindyhuang@csun.com.tw

Analytical Chemistry
|June 25, 2009
PubMed
Summary

We developed a new method using dimethyl labeling and MS/MS analysis to identify disulfide-linked peptides. This approach enhances a1 ion signals, simplifying protein structural characterization.

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Last Updated: Jun 22, 2026

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Area of Science:

  • Proteomics
  • Analytical Chemistry
  • Biochemistry

Background:

  • Disulfide bonds are crucial for protein structure and function.
  • Identifying disulfide linkages is challenging in proteomics.
  • Current methods for disulfide bond assignment can be complex.

Purpose of the Study:

  • To present a novel, simplified approach for assigning disulfide-linked peptides.
  • To improve the identification of N-terminal amino acids in disulfide-linked peptides.
  • To facilitate protein structural characterization through accurate disulfide bond mapping.

Main Methods:

  • Introduction of dimethyl labeling to enhance a1 ion signals in MS/MS.
  • Utilizing multiple a1 ions from multiple N-termini to detect disulfide-linked peptides.
  • Development of a computational algorithm for targeted a1 ion screening and molecular weight matching.

Main Results:

  • Dimethyl labeling generates distinct a1 ion signals for disulfide-linked peptides.
  • The method effectively identifies N-terminal amino acids and narrows down peptide combinations.
  • The computational algorithm accurately identifies disulfide-linked peptides from LC-MS/MS data.

Conclusions:

  • The presented approach offers a simple and direct method for disulfide-linked peptide assignment.
  • This technique provides valuable information for protein structural characterization.
  • The method enhances the capabilities of proteomics for analyzing protein structure.