title: 157 nm photodissociation of dipeptide ions containing N-terminal arginine.
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.
authors: Department of Chemistry, Indiana University, Bloomington, IN, 47405, USA.
authors: Nathaniel
authors: N
authors: Webber
authors: Yi
authors: Y
authors: He
authors: James P
authors: JP
authors: Reilly
mesh_terms: D001120:Arginine / Q000737:chemistry*; D004151:Dipeptides / Q000737:chemistry*; D007477:Ions / Q000737:chemistry*; D055668:Photochemical Processes; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
chemical_list: D004151:Dipeptides; D007477:Ions; D001120:Arginine