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Structure of Aqueous Solutions of Trimethylaminoxide, Urea, and Their Mixture

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Abstract

Aqueous solutions of natural osmolytes (trimethylaminoxide (TMAO), urea, and their mixture) at relatively small (biologically relevant) concentrations are analyzed by the all-atom molecular dynamics simulation. In the recent work (Smolin N. et al. PCCP. 2017. 19. P. 6345) it has been noted that in the protein hydration shell the fraction of TMAO molecules is much smaller than that of urea. The urea addition causes a further decrease in the TMAO fraction in the protein hydration shell. This work shows that in binary solutions urea fraction at urea molecules is always larger than the bulk urea concentration. At the same time, the TMAO fraction near TMAO is the same as in the bulk. In ternary solutions, TMAO and urea behave the same as the binary ones, i.e. they do not noticeably affect each other. This means that the behavior of TMAO and urea molecules in the protein hydration shell is associated with protein rather than their interaction with each other.

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Authors and Affiliations

  1. Novosibirsk State University, Novosibirsk, Russia

    E. D. Kadtsyn, A. V. Anikeenko & N. N. Medvedev

  2. Voevodsky Institute of Kinetics and Combustion, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia

    E. D. Kadtsyn, A. V. Anikeenko & N. N. Medvedev

Authors
  1. E. D. Kadtsyn
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  2. A. V. Anikeenko
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  3. N. N. Medvedev
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Correspondence to N. N. Medvedev.

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Original Russian Text © 2018 E. D. Kadtsyn, A. V. Anikeenko, N. N. Medvedev.

Translated from Zhurnal Strukturnoi Khimii, Vol. 59, No. 2, pp. 359–367, March–April, 2018.

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Kadtsyn, E.D., Anikeenko, A.V. & Medvedev, N.N. Structure of Aqueous Solutions of Trimethylaminoxide, Urea, and Their Mixture. J Struct Chem 59, 347–354 (2018). https://doi.org/10.1134/S0022476618020130

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  • DOI: https://doi.org/10.1134/S0022476618020130

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