Gas phase fragmentations of protein and peptide (M) ions in a mass spectrometer—induced by, for example, electron-capture dissociation1-2 and electron-transfer dissociation3-422 —form the foundation for top-down amino acid sequencing approaches for the rapid identification of protein components in complex biological samples. During these processes, protonated protein and peptide radicals ([M + nH]•(n – 1)+)5–8 are generated; their fragmentations are governed largely by the properties of the unpaired electron. Because of their importance in modern bioanalytical chemistry, considerable attention has been drawn recently toward understanding the radical cation chemistry behind the fragmentations of these odd-electron biomolecular ions in the gas phase.
Revised: May 21, 2014 |
Published: March 28, 2014
Citation
Mu X., T. Song, M. Xu, C. Lai, C. Siu, J. Laskin, and I.K. Chu. 2014.Discovery and Mechanistic Studies of Facile N-Terminal Ca–C Bond Cleavages in the Dissociation of Tyrosine-Containing Peptide Radical Cations.Journal of Physical Chemistry B 118, no. 16:4273-4281.PNNL-SA-99225.doi:10.1021/jp410525f