The structures and properties of proton- and alkali-bound cysteine dimers
Loading...
Date
2016
Authors
Ieritano, Christian
Carr, Patrick J. J.
Hasan, Moaraj
Burt, Michael
Marta, Rick A.
Steinmetz, Vincent
Fillion, Eric
McMahon, Terrance B.
Hopkins, W. Scott
Journal Title
Journal ISSN
Volume Title
Publisher
Royal Society of Chemistry
Abstract
The proton-, lithium-, and sodium-bound cysteine dimers have been investigated in a joint computational and experimental infrared multiple photon dissociation (IRMPD) study. IRMPD spectra in the 1000–2000 cm−1 region show that protonation is localized on an amine group, and that intermolecular hydrogen bonding occurs between the protonated amine and the carbonyl oxygen of the neutral Cys moiety. Alkali-bound dimers adopt structures reminiscent of those observed for the monomeric Cys·Li+ and Cys·Na+ species. Calculations of the heavier Cys2·M+ (M = K, Rb or Cs) species suggest that these are significantly less strongly bound than the lighter (M = H, Li, or Na) dimers.