Ultraviolet, Infrared, and High-Low Energy Photodissociation of Post-Translationally Modified Peptides

  • Mohammad A. Halim
  • Luke MacAleese
  • Jérôme Lemoine
  • Rodolphe Antoine
  • Philippe Dugourd
  • Marion Girod
Focus: 32nd Asilomar Conference, Novel Instrumentation in MS and Ion Mobility: Research Article


Mass spectrometry-based methods have made significant progress in characterizing post-translational modifications in peptides and proteins; however, certain aspects regarding fragmentation methods must still be improved. A good technique is expected to provide excellent sequence information, locate PTM sites, and retain the labile PTM groups. To address these issues, we investigate 10.6 μm IRMPD, 213 nm UVPD, and combined UV and IR photodissociation, known as HiLoPD (high-low photodissociation), for phospho-, sulfo-, and glyco-peptide cations. IRMPD shows excellent backbone fragmentation and produces equal numbers of N- and C-terminal ions. The results reveal that 213 nm UVPD and HiLoPD methods can provide diverse backbone fragmentation producing a/x, b/y, and c/z ions with excellent sequence coverage, locate PTM sites, and offer reasonable retention efficiency for phospho- and glyco-peptides. Excellent sequence coverage is achieved for sulfo-peptides and the position of the SO3 group can be pinpointed; however, widespread SO3 losses are detected irrespective of the methods used herein. Based on the overall performance achieved, we believe that 213 nm UVPD and HiLoPD can serve as alternative options to collision activation and electron transfer dissociations for phospho- and glyco-proteomics.

Graphical Abstract


Photofragmentation Post-translational modifications Fragmentation method UVPD IRMPD 



The research leading to these results has received funding from the European Research Council under the European Union’s Seventh Framework Program (FP7/2007-2013 grant agreement no. 320659).

Supplementary material

13361_2017_1794_MOESM1_ESM.docx (61 kb)
ESM 1 (DOCX 61 kb)


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© American Society for Mass Spectrometry 2017

Authors and Affiliations

  1. 1.Université de Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière MatièreLyonFrance
  2. 2.Université de Lyon, Institut des Sciences Analytiques, UMR 5280, CNRS, Université Lyon 1, ENS LyonVilleurbanneFrance

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