Can far-IR action spectroscopy combined with BOMD simulations be conformation selective?

Jérôme Mahé, Sander Jaeqx, Anouk M. Rijs*, Marie Pierre Gaigeot

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

The combination of conformation selective far-IR/UV double resonance spectroscopy with Born-Oppenheimer molecular dynamics (BOMD) simulations is presented here for the structural characterization of the Ac-Phe-Pro-NH2 peptide in the far-infrared spectral domain, i.e. for radiation below 800 cm-1. Two conformers have been shown to be present in the experiment, namely a conformer with a γ-turn fold (C7 interaction) and a β-turn fold (C10 interaction). The combined experimental and theoretical work presented here aims to provide spectral features typical of each conformer in this far-IR domain. The simulated BOMD far-IR spectra agree well with the experimental spectra and allow direct assignment of the observed bands. These assignments show that the 400-550 cm-1 spectral domain is conformer selective, allowing us to distinguish the H-bond signature of the γ-turn from the β-turn.

Original languageEnglish
Pages (from-to)25905-25914
Number of pages10
JournalPhysical Chemistry Chemical Physics
Volume17
Issue number39
DOIs
Publication statusPublished - 26 May 2015
Externally publishedYes

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