Combining Near-UV Photodissociation with Electron Transfer. Reduction of the Diazirine Ring in a Photomethionine-Labeled Peptide Ion
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  • 作者:Christopher J. Shaffer ; Ale? Marek…
  • 关键词:Electron transfer dissociation ; UV ; photodissociation ; Photomethionine ; Ion structures ; Dissociation kinetics
  • 刊名:Journal of The American Society for Mass Spectrometry
  • 出版年:2015
  • 出版时间:August 2015
  • 年:2015
  • 卷:26
  • 期:8
  • 页码:1367-1381
  • 全文大小:2,700 KB
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  • 作者单位:Christopher J. Shaffer (1)
    Ale? Marek (1)
    Huong T. H. Nguyen (1)
    Franti?ek Ture?ek (1)

    1. Department of Chemistry, University of Washington, Bagley Hall, Box 351700, Seattle, WA, 98195-1700, USA
  • 刊物主题:Analytical Chemistry; Biotechnology; Organic Chemistry; Proteomics; Bioinformatics;
  • 出版者:Springer US
  • ISSN:1879-1123
文摘
Electron transfer dissociation of peptide ions with the diazirine-containing residue photomethionine (M*) results in side-chain dissociations by loss of C3H7N2 radicals in addition to standard backbone cleavages. The side-chain dissociations are particularly prominent upon activation of long-lived, charge-reduced, cation radicals (GM*GGR + 2H)+?/sup>. Investigation of these cation radicals by near-UV photodissociation and collisional activation revealed different fragmentation products and mechanisms resulting from these ion activation modes. The dissociations observed for photomethionine were dramatically different from those previously reported for the lower homologue photoleucine; here, a difference by a single methylene group in the side chain had a large effect on the chemistries of the cation radicals upon ETD and further activation. ETD intermediates and products were probed by tandem 355-nm UV photodissociation-collision induced dissociation and found to contain chromophores that resulted from electron attachment to the diazirine ring. The nature of the newly formed chromophores and ion energetics and kinetics were investigated by electron structure calculations combining ab initio and density functional theory methods and Rice-Ramsperger-Kassel-Marcus (RRKM) theory. The dramatic difference between the dissociations of L* and M* containing peptide cation radicals is explained by electronic effects that play a role in stabilizing critical reaction intermediates and steer the dissociations into kinetically favored reaction channels. In addition, a new alternating UVPD-ETD-UVPD MS4 experiment is introduced and utilized for ion structure elucidation.

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