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      Synergistic behavior of glycine betaine-urea mixture: a molecular dynamics study.

      1 ,
      The Journal of chemical physics
      AIP Publishing

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          Abstract

          Glycine betaine (GB) is one of the most important osmolyte which is known to stabilize proteins as well as counteract the denaturing effect of urea. There have been many studies indicating protein stabilization and counteraction of the effect of urea by GB. However, the exact mechanism of counteraction is still debated and is of important research interest. In this study, distribution functions, hydrogen bonds, and energetics were analysed to understand different interactions between GB and urea, and their solvation properties in presence of each other. The results show that in the GB-urea mixture, GB acted as a stronger osmolyte and urea became a weaker denaturing agent than its individual counterparts. The increase in the solvation of urea and GB in GB-urea mixture and their mutual interactions through hydrogen bonding and coulombic energy resulted in more involvement of GB and urea with solvent as well as with themselves. This might result in the increase of the exclusion of GB from protein surface and decrease in the protein-urea interactions in the mixture. This synergistic behavior might be the prime reason for the counteraction of denaturing effect of urea by GB.

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          Author and article information

          Journal
          J Chem Phys
          The Journal of chemical physics
          AIP Publishing
          1089-7690
          0021-9606
          Sep 21 2013
          : 139
          : 11
          Affiliations
          [1 ] Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400 076, India.
          Article
          10.1063/1.4821615
          24070312
          564b38ed-e063-499f-b7e5-acf6f0d04c92
          History

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