Absorption Mode Broadband 2D MS for Proteomics and Metabolomics.

Fiche publication

Date publication

avril 2026

Journal

Journal of the American Society for Mass Spectrometry

Auteurs

Membres identifiés du Cancéropôle Est :
Dr DELSUC Marc-André

Tous les auteurs :
van Agthoven MA, Polák M, Fiala J, Ounounou CN, Halada P, Palasser M, Briot-Dietsch A, Kádek A, Breuker K, Novák P, Afonso C, Delsuc MA

Lien Pubmed

https://www.ncbi.nlm.nih.gov/pubmed/42041231

Résumé

Two-dimensional mass spectrometry (2D MS) is a method for tandem mass spectrometry that enables the correlation between precursor and fragment ions without the need for ion isolation. On a Fourier transform ion cyclotron resonance mass spectrometer, the phase correction functions for absorption mode data processing were found to be linear in the precursor ion dimension and quadratic in the fragment ion dimension. Phase-corrected absorption mode data processing on limited data sets has previously shown improvements in signal-to-noise ratio (SNR) and resolving power by a factor of 2. Here, we have expanded phase-corrected absorption mode data processing to 2D mass spectra regardless of size and frequency range. We have applied phase-corrected absorption mode 2D MS to top-down analysis of variously oxidized ubiquitin proteoforms generated by fast photochemical oxidation of proteins (FPOP) and to an extract of ergot alkaloids. We show that phase-corrected absorption mode data processing significantly improves both the SNR and the resolving power of the 2D mass spectrum compared to standard magnitude mode in terms of sequence coverage in top-down proteomics, as well as the accuracy of precursor-fragment correlation in metabolomics.