Radical-driven processes within a peptidic sequence of type I collagen upon single-photon ionisation in the gas phase

Lucas Schwob, Mathieu Lalande, Dmitrii Egorov, Jimmy Rangama, Ronnie Hoekstra, Violaine Vizcaino, Thomas Schlathölter, Jean-Christophe Poully*

*Bijbehorende auteur voor dit werk

OnderzoeksoutputAcademicpeer review

9 Citaten (Scopus)
51 Downloads (Pure)


We report on an experimental single-photon absorption study on gas-phase protonated collagen peptides employing a combination of mass spectrometry and synchrotron radiation. Partial ion yields for the main photoabsorption products vary steadily with photon energy over the range from 14 to 545 eV. At low energy, non-dissociative photoionisation competes with neutral molecule loss from the precursor ion, whereas fragmentation of the peptide backbone dominates at soft X-ray energies. Neutral molecule losses from the ionised peptide are found to have low energy barriers and most likely involve amino-acid residue side-chains with radical character, in particular aspartic acid. A particularly interesting finding is photoinduced loss of proline hydroxylation. The loss of this typical collagen post-translational modification might play a destabilizing role in the collagen structure.

Originele taal-2English
Pagina's (van-tot)22895-22904
Aantal pagina's10
TijdschriftPPCP : Physical Chemistry Chemical Physics
Nummer van het tijdschrift34
StatusPublished - 14-sep.-2017

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