Electron capture in spin-trap capped peptides. An experimental example of ergodic dissociation in peptide cation-radicals View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2007-03-01

AUTHORS

Jace W. Jones, Tomikazu Sasaki, David R. Goodlett, František Turecček

ABSTRACT

Electron capture dissociation was studied with tetradecapeptides and pentadecapeptides that were capped at N-termini with a 2-(4′-carboxypyrid-2′-yl)-4-carboxamide group (pepy), e. g., pepy-AEQLLQEEQLLQEL-NH2, pepy-AQEFGEQGQKALKQL-NH2, and pepy-AQEGSEQAQKFFKQL-NH2. Doubly and triply protonated peptide cations underwent efficient electron capture in the ion-cyclotron resonance cell to yield charge-reduced species. However, the electron capture was not accompanied by backbone dissociations. When the peptide ions were preheated by absorption of infrared photons close to the dissociation threshold, subsequent electron capture triggered ion dissociations near the remote C-terminus forming mainly (b11–14+1)+· fragment ions that were analogous to those produced by infrared multiphoton dissociation alone. Ab initio calculations indicated that the N-1 and N-1′ positions in the pepy moiety had topical gas-phase basicities (GB=923 kJ mol−1) that were greater than those of backbone amide groups. Hence, pepy was a likely protonation site in the doubly and triply charged ions. Electron capture in the protonated pepy moiety produced the ground electronic state of the charge-reduced cation-radical with a topical recombination energy, RE=5.43–5.46 eV, which was greater than that of protonated peptide residues. The hydrogen atom in the charge-reduced pepy moiety was bound by >160 kJ mol−1, which exceeded the hydrogen atom affinity of the backbone amide groups (21–41 kJ mol−1). Thus, the pepy moiety functioned as a stable electron and hydrogen atom trap that did not trigger radical-type dissociations in the peptide backbone that are typical of ECD. Instead, the internal energy gained by electron capture was redistributed over the peptide moiety, and when combined with additional IR excitation, induced proton-driven ion dissociations which occurred at sites that were remote from the site of electron capture. This example of a spin-remote fragmentation provided the first clear-cut experimental example of an ergodic dissociation upon ECD. More... »

PAGES

432-444

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1016/j.jasms.2006.10.005

DOI

http://dx.doi.org/10.1016/j.jasms.2006.10.005

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1023279745

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/17112737


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