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Updated: Jul 15, 2026

Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
Published on: December 16, 2013
Effects of chain length and N-methylation on a cation-pi interaction in a beta-hairpin peptide
Robert M Hughes1, Matthew L Benshoff, Marcey L Waters
1Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3290, USA.
Abstract:
The effects of N-methylation and chain length on a cation-pi interaction have been investigated within the context of a beta-hairpin peptide. Significant enhancement of the interaction and structural stabilization of the hairpin have been observed upon Lys methylation. Thermodynamic analysis indicates an increased entropic driving force for folding upon methylation of Lys residues. Comparison of lysine to analogues ornithine (Orn) and diaminobutyric acid (Dab) indicates that lysine provides the strongest cation-pi interaction and also provides the most stable beta-hairpin due to a combination of side chain-side chain interactions and beta-sheet propensities. These studies have significance for the recognition of methylated lysine in histone proteins.
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