Naslov
Proton transfer reactions for improved peptide characterisation

Autori
Rožman, Marko ; Schneider, Andrea ; Gaskell, Simon J. ;

Izvornik
Journal of mass spectrometry (1076-5174) 46 (2011), 6; 529-534

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
ion/molecule reaction; ion/ion reaction; collision induced dissociation; peptide identification; charge state

Sažetak
The combination of deprotonation (via ion/molecule and ion/ion reactions) and low-energy collision-induced dissociation (CID) has been explored for the enhanced characterisation of tryptic peptides via access to different precursor charge states. This approach allows instant access to fragmentation properties of singly and doubly protonated precursors (arising from the availability of mobile protons) in a single experiment. Considering both charge states extended our base of structurally informative data (in comparison with considering just a single charge state) due to generation of additional sequence ions and by obtaining supplementary structural information derived from selective cleavages. Roughly 37% of combined data sets (CID spectra of doubly and singly charged precursor) showed a greater database identification confidence than each set alone. Moreover, comparison between a number of sequence ions of the singly charged precursor and the doubly charged precursor provided a mean of distinguishing the two classes of tryptic peptides (arginine or lysine containing).

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA