Ultra-Accurate Correlation between Precursor and Fragment Ions in Two-Dimensional Mass Spectrometry: Acetylated vs Trimethylated Histone

0571658 - MBÚ 2024 RIV US eng J - Journal Article
Palasser, M. - Heel, S. - Delsuc, M. - Breuker, K. - van Agthoven, Maria Andrea
Ultra-Accurate Correlation between Precursor and Fragment Ions in Two-Dimensional Mass Spectrometry: Acetylated vs Trimethylated Histone.
Journal of the American Society for Mass Spectrometry. Roč. 34, č. 4 (2023), s. 608-616. ISSN 1044-0305. E-ISSN 1879-1123
Institutional support: RVO:61388971
Keywords : electron-capture dissociation * filter diagonalization method * cyclotron resonance cell * top-dow * resolution * modulation * excitation * spectra * trap
OECD category: Microbiology
Impact factor: 3.2, year: 2022
Method of publishing: Open access
https://pubs.acs.org/doi/10.1021/jasms.2c00319

Two-dimensional mass spectrometry (2D MS) is a method for tandem mass spectrometry in which precursor and fragment ions are correlated by manipulating ion radii rather than by ion isolation. A 2D mass spectrum contains the fragmentation patterns of all analytes in a sample, acquired in parallel. We report ultrahigh-resolution narrowband 2D mass spectra of a mixture of two histone peptides with the same sequence, one of which carries an acetylation and the other a trimethylation (m/z 0.006 difference). We reduced the distance between data points in the precursor ion dimension and compared the accuracy of the precursor-fragment correlation with the resolving power. We manage to perform label-free quantification on the histone peptide mixture and show that precursor and fragment ions can be accurately correlated even though the precursor ions are not resolved. Finally, we show that increasing the resolution of a 2D mass spectrum in the precursor ion dimension too far can lead to a decline in the signal-to-noise ratio.
Permanent Link: https://hdl.handle.net/11104/0342962