title: Use of 157-nm photodissociation to probe structures of y- and b-type ions produced in collision-induced dissociation of peptide ions.
abstract: y- and b-type fragment ions produced in the collisional dissociation of arginine-terminated peptide ions are photodissociated with 157-nm light in a linear trap. y-type ions are shown to have the same structure as that of intact peptides of the same sequence with the ionizing proton located at the most basic residue(s). For generic b-type ions, the ionizing proton is shown to be sequestered at the N-terminal arginine, which is consistent with the proposed oxazolone structure.
authors.affiliation: Department of Chemistry, Indiana University, Bloomington, Indiana 47405-4001, USA.
authors.forename: Liangyi
authors.initials: L
authors.lastname: Zhang
authors.forename: James P
authors.initials: JP
authors.lastname: Reilly
mesh_terms: D000595:Amino Acid Sequence; D007477:Ions; D008027:Light; D008969:Molecular Sequence Data; D010449:Peptide Mapping / Q000379:methods*; D010455:Peptides / Q000737:chemistry* / Q000528:radiation effects*; D010777:Photochemistry / Q000379:methods*; D020539:Sequence Analysis, Protein / Q000379:methods*; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
chemical_list: D007477:Ions; D010455:Peptides