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• W4306809737 startingPage "8669" @default.
• W4306809737 abstract "Biomolecular binding relies on specific attractive interactions between two partner molecules, including electrostatics, dispersion, hydrophobicity, and solvation. Assessing the contributions of electrostatic interactions to binding is key to the understanding of ligand binding mechanisms and the design of improved biomolecular binders. For example, nicotine is a well-known agonist of nicotinic acetylcholine receptors (nAChRs), but the molecular mechanisms for the differential action of nicotine on brain and muscle nAChRs remain elusive. In this work, we have chosen the acetylcholine binding protein (AChBP) in complex with nicotine as a model system to interrogate the electrostatic contributions to nicotine binding. Our absolute binding free energy simulations confirm that nicotine binds AChBP predominantly in its protonated (charged) form. By comparing energetic contributions from decomposed interactions for either neutral or charged nicotine, our calculations shed light on the nature of the binding of nicotine to the AChBP. The preferred binding of charged nicotine over neutral nicotine originates from its stronger electrostatic interactions with AChBP, a cation−π interaction to a tryptophan residue and a hydrogen bond between nicotine and the backbone carbonyl of the tryptophan, whereas the major force driving the binding process appears to be van der Waals interactions. The various nonelectrostatic terms can also indirectly modulate the electrostatic interactions through fine-tuning the binding pose of the ligand in the binding site, providing an explanation of why the binding specificity of nicotine to the brain versus muscle nAChRs is driven by electrostatic interaction, given that the immediate binding site residues, including the key tryptophan residue, are identical in the two receptors." @default.
• W4306809737 created "2022-10-20" @default.
• W4306809737 creator A5036699619 @default.
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• W4306809737 date "2022-10-19" @default.
• W4306809737 modified "2023-09-23" @default.
• W4306809737 title "Electrostatic Contributions to the Binding Free Energy of Nicotine to the Acetylcholine Binding Protein" @default.
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• W4306809737 doi "https://doi.org/10.1021/acs.jpcb.2c04641" @default.
• W4306809737 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36260486" @default.
• W4306809737 hasPublicationYear "2022" @default.
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