Abstract
Twenty singly-charged dipeptide ions with N-terminal arginine were photodissociated using 157 nm light in both a linear ion-trap mass spectrometer and a MALDI-TOF-TOF mass spectrometer. Analogous to previous work on dipeptides containing C-terminal arginine, this set of samples enabled insights into the photofragmentation propensities associated with individual residues. In addition to familiar products such as a-, d-, and immonium ions, m2 and m2+13 ions were also observed. Certain side chains tended to cleave between their β and γ carbons without necessarily forming d- or w-type ions, and a few other ions were produced by the high-energy fragmentation of multiple bonds.
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The authors acknowledge support for this work by grant CHE-1012855 from the National Science Foundation.
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Webber, N., He, Y. & Reilly, J.P. 157 nm Photodissociation of Dipeptide Ions Containing N-Terminal Arginine. J. Am. Soc. Mass Spectrom. 25, 196–203 (2014). https://doi.org/10.1007/s13361-013-0762-2
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DOI: https://doi.org/10.1007/s13361-013-0762-2