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- W1997723318 abstract "The molecular mechanism of urea-induced protein denaturation is not yet fully understood. Mainly two opposing mechanisms are controversially discussed, according to which either hydrophobic, or polar interactions are the dominant driving force. To resolve this question, we have investigated the interactions between urea and all 20 amino acids by comprehensive molecular dynamics simulations of 22 tripeptides. Calculation of atomic contact frequencies between the amino acids and solvent molecules revealed a clear profile of solvation preferences by either water or urea. Almost all amino acids showed preference for contacts with urea molecules, whereas charged and polar amino acids were found to have slight preferences for contact with water molecules. Particularly strong preference for contacts to urea were seen for aromatic and apolar side-chains, as well as for the protein backbone of all amino acids. Further, protein-urea hydrogen bonds were found to be significantly weaker than protein-water or water-water hydrogen bonds. Our results suggest that hydrophobic interactions are the dominant driving force, while hydrogen bonds between urea and the protein backbone contribute markedly to the overall energetics by avoiding unfavorable unsatisfied hydrogen bond sites on the backbone. In summary, we suggest a combined mechanism that unifies the two current and seemingly opposing views." @default.
- W1997723318 created "2016-06-24" @default.
- W1997723318 creator A5021041237 @default.
- W1997723318 creator A5045212144 @default.
- W1997723318 date "2007-11-30" @default.
- W1997723318 modified "2023-10-17" @default.
- W1997723318 title "Interaction of Urea with Amino Acids: Implications for Urea-Induced Protein Denaturation" @default.
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- W1997723318 doi "https://doi.org/10.1021/ja076216j" @default.
- W1997723318 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18047342" @default.
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