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A quantum-topological analysis of noncovalent interactions in secondary polyalanine structures

  • Structure of Chemical Compounds
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Abstract

The geometric parameters and relative stability of γ- and β-loop conformers of oligomers based on alanine were determined by the Kohn-Sham method (the B3LYP/6–31+G** approximation). The three-dimensional architecture of the β-folded structure and protein α-helix was reproduced using Kohn-Sham calculations with periodic boundary conditions. The Bader quantum-topological molecular structure theory was used to reveal and quantitatively characterize noncovalent interatomic interactions in the secondary structures of model peptides under consideration. Earlier unnoticed additional noncovalent interactions stabilizing the structures under consideration were revealed. In β-loops, these are C-H⋯O and H⋯H interactions, and, in antiparallel β-folded structures, these are weak Cβ-H⋯H-Cβ interactions between side chains. Additional weak bonding interaction between C=O groups in position i and H-Cβ groups in position i + 3 was revealed for the protein α-helix; this interaction is usually ignored in amino acid folding simulations with the use of classic force fields.

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Authors and Affiliations

  1. Mendeleev University of Chemical Technology, Miusskaya pl. 9, Moscow, 125190, Russia

    M. V. Vener, A. N. Egorova, D. P. Fomin & V. G. Tsirel’son

Authors
  1. M. V. Vener
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  2. A. N. Egorova
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  3. D. P. Fomin
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  4. V. G. Tsirel’son
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Correspondence to M. V. Vener.

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Original Russian Text © M.V. Vener, A.N. Egorova, D.P. Fomin, V.G. Tsirel’son, 2009, published in Khimicheskaya Fizika, 2009, Vol. 28, No. 8, pp. 3–10.

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Vener, M.V., Egorova, A.N., Fomin, D.P. et al. A quantum-topological analysis of noncovalent interactions in secondary polyalanine structures. Russ. J. Phys. Chem. B 3, 541–547 (2009). https://doi.org/10.1134/S1990793109040046

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  • DOI: https://doi.org/10.1134/S1990793109040046

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