Role of the site of protonation in the low-energy decompositions of gas-phase peptide ions View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

1996-06

AUTHORS

Kathleen A. Cox, Simon J. Gaskell, Michael Morris, Andrew Whiting

ABSTRACT

The dissociation of singly or multiply protonated peptide ions by using low-energy collisional activation (CA) is highly dependent on the sites of protonation. The presence of strongly basic amino acid residues in the peptide primary structure dictates the sites of protonation, which generates a precursor ion population that is largely homogeneous with respect to charge sites. Attempts to dissociate this type of precursor ion population by low-energy CA result in poor fragmentation via few pathways. The work described here represents a systematic investigation of the effects of charge heterogeneity in the precursor ion population of a series of model peptides in low-energy CA experiments. Incorporation of acidic residues in the peptide RLC*IFSC*FR (where C* indicates a cysteic acid residue), for example, balances the charge on the basic arginine residues, which enables the ionizing protons to reside on a number of less basic sites along the peptide backbone. This results in a precursor ion population that is heterogeneous with respect to charge site. Low-energy CA of these ions results in diverse and efficient fragmentation. Molecular modeling has been utilized to demonstrate that energetically preferred conformations incorporate an intraionic interaction between arginine and cysteic acid residues. More... »

PAGES

522-531

Identifiers

URI

http://scigraph.springernature.com/pub.10.1016/1044-0305(96)00019-0

DOI

http://dx.doi.org/10.1016/1044-0305(96)00019-0

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1038298743

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/24203424


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