Journal Article

PUBDB-2021-01567

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The influence of the methionine residue on the dissociation mechanisms of photoionized methionine-enkephalin probed by VUV action spectroscopy

Dörner, S. (Corresponding author)DESY* ; Schwob, L. (Corresponding author)DESY* ; Schubert, K. (Corresponding author)DESY* ; Girod, M. ; MacAleese, L.Extern*XFEL.EU* ; Pieterse, C. L. ; Schlathoelter, T.Extern* ; Techert, S. (Corresponding author)XFEL.EU*DESY* ; Bari, S. (Corresponding author)DESY*

2021
Springer Heidelberg

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Please use a persistent id in citations: doi:10.1140/epjd/s10053-021-00147-y  doi:10.3204/PUBDB-2021-01567

Abstract: VUV action spectroscopy has recently gained interest for the study of peptides and proteins. However, numerous aspects of the fundamental processes involved in the photodissociation are yet to be understood. It can, for example, be expected that sulfur-containing amino-acid residues have a significant impact on the dissociation processes following photoionization because of their potential involvement in the transport of electron holes in proteins. In order to investigate the influence of the sulfur-containing methionine residue on the VUV photodissociation of a small peptide a VUV action spectroscopy study of gas-phase protonated methionine-enkephalin and leucine-enkephalin in the photon energy range of 6–35 eV was performed. The results show that upon non-ionizing photoexcitation, the fragmentation patterns of the two peptides are nearly identical, whereas significant differences were observed upon photoionization. The differences between the fragment yields and the identified specific dissociation channels for methionineenkephalin could be explained by the high electron hole affinity of sulfur, which efficiently directs the radical to the methionine side chain. Additionally, for both peptides the presence of the intact photoionized precursor ions was confirmed by their isotopic patterns and the stability of these species could be evaluated.

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Contributing Institute(s):

1. Strukturdynamik Chemischer Systeme (FS-SCS)

Research Program(s):

1. 633 - Life Sciences – Building Blocks of Life: Structure and Function (POF4-633) (POF4-633)
2. VH-NG-1104 - Structure and dynamics of gas-phase biomolecules studied by photon-induced ionization and dissociation (2007_IVF-VH-NG-1104) (2007_IVF-VH-NG-1104)
3. DFG project 28586557 - SFB 755: Photonische Abbildungen auf der Nanometerskala (28586557) (28586557)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2021

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Springer ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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