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• W3183403125 abstract "High pressures can be detrimental for protein stability, resulting in unfolding and loss of function. This phenomenon occurs because the unfolding transition is accompanied by a decrease in volume, which is typically attributed to the elimination of cavities that are present within the native state as a result of packing defects. We present a novel computational approach that enables the study of pressure unfolding in atomistically detailed protein models in implicit solvent. We include the effect of pressure using a transfer free energy term that allows us to decouple the effect of protein residues and bound water molecules on the volume change upon unfolding. We discuss molecular dynamics simulations results using this protocol for two model proteins, Trp-cage and staphylococcal nuclease (SNase). We find that the volume reduction of bound water is the key energetic term that drives protein denaturation under the effect of pressure, for both Trp-cage and SNase. However, we note differences in unfolding mechanisms between the smaller Trp-cage and the larger SNase protein. Indeed, the unfolding of SNase, but not Trp-cage, is seen to be further accompanied by a reduction in the volume of internal cavities. Our results indicate that, for small peptides, like Trp-cage, pressure denaturation is driven by the increase in solvent accessibility upon unfolding, and the subsequent increase in the number of bound water molecules. For larger proteins, like SNase, the cavities within the native fold act as weak spots, determining the overall resistance to pressure denaturation. Our simulations display a striking agreement with the pressure-unfolding profile experimentally obtained for SNase and represent a promising approach for a computationally efficient and accurate exploration of pressure-induced denaturation of proteins." @default.
• W3183403125 created "2021-08-02" @default.
• W3183403125 creator A5029066415 @default.
• W3183403125 creator A5034511172 @default.
• W3183403125 date "2021-07-26" @default.
• W3183403125 modified "2023-10-18" @default.
• W3183403125 title "Pressure Unfolding of Proteins: New Insights into the Role of Bound Water" @default.
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• W3183403125 doi "https://doi.org/10.1021/acs.jpcb.1c04398" @default.
• W3183403125 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34310136" @default.
• W3183403125 hasPublicationYear "2021" @default.
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