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Peptide Identification Using Tandem Mass Spectrometry01:33

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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.
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Split-and-pool Synthesis and Characterization of Peptide Tertiary Amide Library
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Sequential amidation of peptide C-termini for improving fragmentation efficiency.

Qiong Wu1, Yu'e Tian2, Chao Yang1

  • 1CAS Key Laboratory of Separation Science for Analytical Chemistry, National Chromatographic Research and Analysis Center, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, 116023, China.

Journal of Mass Spectrometry : JMS
|May 19, 2020
PubMed
Summary

A new method, C-termini sequential amidation reaction (CSAR), enhances peptide fragmentation efficiency by adding basic groups to C-termini. This improves nontryptic peptide identification in proteomics.

Keywords:
C-terminicharge statesfragmentation efficiencypeptide amidasesequential amidation

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Area of Science:

  • Proteomics
  • Analytical Chemistry
  • Biochemistry

Background:

  • Nontryptic peptide identification is limited by poor fragmentation efficiency due to the absence of positive charges at peptide C-termini.
  • Chemical derivatization to add positive charges to C-termini can enhance peptide fragmentation.

Purpose of the Study:

  • To introduce and optimize a novel strategy, C-termini sequential amidation reaction (CSAR), for improving peptide fragmentation efficiency.
  • To enhance the identification of nontryptic peptides in proteomics.

Main Methods:

  • CSAR involves sequential amidation: initial neutral amidation of carboxyl groups with methylamine (MA), selective deamidation of C-terminal amides, and secondary amidation with basic agmatine (AG).
  • Reaction conditions were optimized for high derivatization efficiency (>99% for MA, 80% for AG).

Main Results:

  • Application of CSAR to chymotryptic digests of bovine serum albumin (BSA) significantly increased fragmentation efficiencies (9-32%) and charge states (39-52%).
  • Improvements were observed under both single and multiple dissociation modes.

Conclusions:

  • CSAR is a promising strategy for improving the fragmentation efficiency and identification of peptides, particularly those with inherent limitations.
  • This method offers a potential solution for challenges in identifying peptides with poor fragmentation characteristics in proteomics.