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• W3132180101 endingPage "1299" @default.
• W3132180101 startingPage "1287" @default.
• W3132180101 abstract "Protein dynamics play an important role in small molecule binding and can pose a significant challenge in the identification of potential binding sites. Cryptic binding sites have been defined as sites which require significant rearrangement of the protein structure to become physically accessible to a ligand. Mixed-solvent MD (MixMD) is a computational protocol which maps the surface of the protein using molecular dynamics (MD) of the unbound protein solvated in a 5% box of probe molecules with explicit water. This method has successfully identified known active and allosteric sites which did not require reorganization. In this study, we apply the MixMD protocol to identify known cryptic sites of 12 proteins characterized by a wide range of conformational changes. Of these 12 proteins, three require reorganization of side chains, five require loop movements, and four require movement of more significant structures such as whole helices. In five cases, we find that standard MixMD simulations are able to map the cryptic binding sites with at least one probe type. In two cases (guanylate kinase and TIE-2), accelerated MD, which increases sampling of torsional angles, was necessary to achieve mapping of portions of the cryptic binding site missed by standard MixMD. For more complex systems where movement of a helix or domain is necessary, MixMD was unable to map the binding site even with accelerated dynamics, possibly due to the limited timescale (100 ns for individual simulations). In general, similar conformational dynamics are observed in water-only simulations and those with probe molecules. This could imply that the probes are not driving opening events but rather take advantage of mapping sites that spontaneously open as part of their inherent conformational behavior. Finally, we show that docking to an ensemble of conformations from the standard MixMD simulations performs better than docking the apo crystal structure in nine cases and even better than half of the bound crystal structures. Poorer performance was seen in docking to ensembles of conformations from the accelerated MixMD simulations." @default.
• W3132180101 created "2021-03-01" @default.
• W3132180101 creator A5032834920 @default.
• W3132180101 creator A5074146124 @default.
• W3132180101 date "2021-02-18" @default.
• W3132180101 modified "2023-09-29" @default.
• W3132180101 title "Identification of Cryptic Binding Sites Using MixMD with Standard and Accelerated Molecular Dynamics" @default.
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• W3132180101 doi "https://doi.org/10.1021/acs.jcim.0c01002" @default.
• W3132180101 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8091066" @default.
• W3132180101 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33599485" @default.
• W3132180101 hasPublicationYear "2021" @default.
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