Conformations and vibrational spectra of a model tripeptide: change of secondary structure upon micro-solvation

Literature Information

Publication Date 2010-02-23
DOI 10.1039/B926413B
Impact Factor 3.676
Authors

Hui Zhu, Martine Blom, Isabel Compagnon, Anouk M. Rijs, Santanu Roy, Gert von Helden, Burkhard Schmidt


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Abstract

Mid-infrared (IR) hole burning spectra of the model tripeptide Z-Aib-Pro-NHMe (Z = benzyloxycarbonyl) in gas phase and its micro-clusters with one and two methanol molecules are presented. To establish a relation between experimental spectra and the underlying conformations, calculations at the DFT [B3LYP/6-311++G(d,p)] level of theory are performed. In particular, the intra-peptide and the peptide–methanol hydrogen bonds can be identified from spectral shifts in the amide I, II, and III regions. While the unsolvated tripeptide as well as its one-methanol cluster prefer a γ-turn structure, a β-turn structure is found for the two-methanol cluster, in agreement with previous condensed phase studies. Comparison of measured and simulated spectra reveals that the favorable methanol binding sites are at the head and tail parts of the tripeptide. The interconversions between γ-turn and β-turn structures are governed by potential barriers below 10 kJ mol−1 inside one of the low energy basins of the potential energy surface.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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