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| Content Provider | Springer Nature Link |
|---|---|
| Author | Pilo, Alice L. Bu, Jiexun McLuckey, Scott A. |
| Copyright Year | 2015 |
| Abstract | The gas-phase oxidation of doubly protonated peptides is demonstrated here using ion/ion reactions with a suite of reagents derived from persulfate. Intact persulfate anion (HS$_{2}$O$_{8}$ $^{–}$), peroxymonosulfate anion (HSO$_{5}$ $^{–}$), and sulfate radical anion (SO$_{4}$ $^{–•}$) are all either observed directly upon negative nanoelectrospray ionization (nESI) or easily obtained via beam-type collisional activation of persulfate into the mass spectrometer. Ion/ion reactions between each of these reagents and doubly protonated peptides result in the formation of a long-lived complex. Collisional activation of the complex containing a peroxymonosulfate anion results in oxygen transfer from the reagent to the peptide to generate the [M+H+O]$^{+}$ species. Activation of the complex containing intact persulfate anion either results in oxygen transfer to generate the [M+H+O]$^{+}$ species or abstraction of two hydrogen atoms and a proton to generate the [M – H]$^{+}$ species. Activation of the complex containing sulfate radical anion results in abstraction of one hydrogen atom and a proton to form the peptide radical cation, [M]$^{+•}$. This suite of reagents allows for the facile transformation of the multiply protonated peptides obtained via nESI into a variety of oxidized species capable of providing complementary information about the sequence and structure of the peptide. Graphical Abstract ᅟ |
| Starting Page | 1103 |
| Ending Page | 1114 |
| Page Count | 12 |
| File Format | |
| ISSN | 10440305 |
| Journal | Journal of The American Society for Mass Spectrometry |
| Volume Number | 26 |
| Issue Number | 7 |
| e-ISSN | 18791123 |
| Language | English |
| Publisher | Springer US |
| Publisher Date | 2015-05-06 |
| Publisher Institution | The American Society for Mass Spectrometry |
| Publisher Place | New York |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Ion/ion reactions Multiply protonated peptide Persulfate Sulfate radical anion Peroxymonosulfate Analytical Chemistry Biotechnology Organic Chemistry Proteomics Bioinformatics |
| Content Type | Text |
| Resource Type | Article |
| Subject | Spectroscopy Structural Biology |
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