Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 112, Issue 26, Pages 7903-7908Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp800370e
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Effects of urea on protein stability have been studied from all-atom molecular dynamics simulations of ubiquitin, G311 protein, and immunoglobulin binding domain (B1) of streptococcal protein G (GB I) in water and 8 M aqueous urea solution. The mechanism of the change in the solvent environment and the early events in protein unfolding by urea have been identified with emphasis on the change in the interactions of hydrophilic and hydrophobic parts of the protein by calculating the potential of mean force (PMF). Urea replaces the protein-protein and protein-water contacts by forming stronger contacts with the protein, which is indicated by the longer survival times of the protein-urea hydrogen bonds.
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