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Related Experiment Videos

Simulating electron transfer attachment to a positively charged model peptide.

Iwona Anusiewicz1, Joanna Berdys-Kochanska, Piotr Skurski

  • 1Department of Chemistry and Henry Eyring Center for Theoretical Chemistry, University of Utah, Salt Lake City, Utah 84112, USA.

The Journal of Physical Chemistry. A
|January 27, 2006
PubMed
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Electron transfer dissociation (ETD) mass spectrometry in peptides is investigated using ab initio methods. Electron transfer preferentially occurs at the amine site, leading to similar radical products via distinct pathways, aiding ETD mechanism understanding.

Area of Science:

  • Computational Chemistry
  • Mass Spectrometry
  • Chemical Physics

Background:

  • Electron-transfer dissociation (ETD) is a key technique for peptide sequencing.
  • Understanding the electron transfer mechanism is crucial for interpreting ETD fragmentation patterns.
  • Model systems are essential for dissecting complex chemical events in ETD.

Purpose of the Study:

  • To computationally investigate the electron transfer event in ETD mass spectrometry.
  • To model the interaction between a peptide cation and an anion.
  • To elucidate the factors governing electron transfer site selectivity and subsequent fragmentation.

Main Methods:

  • Utilized ab initio electronic structure methods.
  • Employed stabilization method tools for metastable states.

Related Experiment Videos

  • Modeled a peptide cation (H(3)C-(C=O)NH-CH(2)-CH(2)-NH(3)(+)) colliding with a methyl anion (CH(3)(-)).

    • Main Results:

    • Electron transfer cross-sections to the protonated amine site were significantly higher (2 orders of magnitude) than to the amide site.
    • Both amine-attached and amide-attached intermediates lead to the same carbon-centered radical product.
    • Distinct reaction pathways were identified for amine-attached versus amide-attached species leading to the radical product.

    Conclusions:

    • The amine site is the preferred site for electron transfer in this model system.
    • The fragmentation pathways in ETD are influenced by the initial electron transfer site.
    • This study provides insights into peptide fragmentation mechanisms relevant to ETD mass spectrometry.