Changes in dissociation efficiency and kinetics of peptide ions induced by basic residues and their mechanistic implication

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Title
Changes in dissociation efficiency and kinetics of peptide ions induced by basic residues and their mechanistic implication
Author(s)
S H Yoon; Jeong Hee Moon; M S Kim
Bibliographic Citation
Journal of American Society for Mass Spectrometry, vol. 22, no. 2, pp. 214-220
Publication Year
2011
Abstract
With matrix-assisted laser desorption ionization (MALDI) time-of-flight (TOF) mass spectrometry, total abundance of product ions formed by dissociation inside (in-source decay, ISD) and outside (post-source decay, PSD) the source was measured for peptide ions [Y5X + H]+, [XY5 + H]+, [Y2XY3 + H]+, and [XY 4X + H]+ (X = tyrosine (Y), histidine (H), lysine (K), and arginine (R) with H for the ionizing proton). α-Cyano-4-hydroxycinammic acid was used as matrix. Product abundance became smaller in the presence of basic residues (H, K, and R), in the order Y > H ? K > R. In particular, product abundances in ISD of peptide ions with R were smaller than those with H or K by an order of magnitude, which, in turn, were smaller than that for [Y6 + H]+ by an order of magnitude. Product abundance was affected by the most basic residue when more than one basic residue was present. A kinetic explanation for the data was attempted under the assumption of quasi-thermal equilibrium for peptide ions in MALDI plume which undergoes expansion cooling. Dramatic disparity in product abundance was found to arise from small difference in critical energy and entropy. Results indicate similar transition structures regardless of basic residues present, where the ionizing proton keeps interacting with a basic site. Further implication of the results on the dissociation mechanism along b-y channels is discussed.
Keyword
Basic residue effectDissociation efficiencyDissociation kinetics and mechanismIn-source decayMALDIPeptide dissociationPost-source decay
ISSN
1044-0305
Publisher
Amer Soc Mass Spectr
DOI
http://dx.doi.org/10.1007/s13361-010-0043-2
Type
Article
Appears in Collections:
Division of Bio Technology Innovation > Core Research Facility & Analysis Center > 1. Journal Articles
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