2022•Journal of the American Society for Mass SpectrometryOpen access

Multimodal Tandem Mass Spectrometry Techniques for the Analysis of Phosphopeptides

Johanna Paris, Alina Theisen, Bryan P. Marzullo, Anisha Haris, Tomos E. Morgan, Mark P. Barrow, John O’Hara, Peter B. O’Connor

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Abstract

Collisionally activated dissociation (CAD), infrared multiphoton dissociation (IRMPD), ultraviolet photodissociation (UVPD), electron capture dissociation and electron detachment dissociation (EDD) experiments were conducted on a set of phosphopeptides, in a Fourier transform ion cyclotron resonance mass spectrometer. The fragmentation patterns were compared and varied according to the fragmentation mechanisms and the composition of the peptides. CAD and IRMPD produced similar fragmentation profiles of the phosphopeptides, while UVPD produced a large number of complementary fragments. Electron-based dissociation techniques displayed lower fragmentation efficiencies, despite retaining the labile phosphate group, and drastically different fragmentation profiles. EDD produced complex spectra whose interpretation proved challenging.

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Key concepts: Infrared multiphoton dissociation, Chemistry, Electron-capture dissociation, Fragmentation (computing), Tandem mass spectrometry, Fourier transform ion cyclotron resonance, Photodissociation, Dissociation (chemistry)