4.8 Article

Ramachandran Plot for Alanine Dipeptide as Determined from Raman Optical Activity

期刊

JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 4, 期 16, 页码 2763-2768

出版社

AMER CHEMICAL SOC
DOI: 10.1021/jz401366j

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  1. Academy of Sciences [M200551205]
  2. Ministry of Education of the Czech Republic [LH11033, LM2010005]
  3. [P208/11/0105]

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Accessible values of the phi and psi torsional angles determining peptide main chain conformation are traditionally displayed in the form of Ramachandran plots. The number of experimental methods making it possible to determine such conformational distribution is limited. In the present study, Raman optical activity (ROA) spectra of Ac-Ala-NHMe were measured and fit by theoretical curves. This revealed the most favored conformers and a large part of the potential energy surface (PES) of this model dipeptide. Such experimental PES compares well to quantum chemical computations, whereas molecular dynamics (MD) modeling reproduces it less faithfully. The surface shape is consistent with the temperature dependence of the spectra, as observed experimentally and predicted by MD. Despite errors associated with spectral modeling and the measurement, the results are likely to facilitate future applications of ROA spectroscopy.

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