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• W4385295265 endingPage "4748" @default.
• W4385295265 startingPage "4732" @default.
• W4385295265 abstract "The development of safe therapeutics to manage pain is of central interest for biomedical applications. The fluorinated fentanyl derivative N-(3-fluoro-1-phenethylpiperidin-4-yl)-N-phenylpropionamide (NFEPP) is potentially a safer alternative to fentanyl because unlike fentanyl─which binds to the μ-opioid receptor (MOR) at both physiological and acidic pH─NFEPP might bind to the MOR only at acidic pH typical of inflamed tissue. Knowledge of the protonation-coupled dynamics of the receptor-drug interactions is thus required to understand the molecular mechanism by which receptor activation initiates cell signaling to silence pain. To this end, here we have carried out extensive atomistic simulations of the MOR in different protonation states, in the absence of opioid drugs, and in the presence of fentanyl vs NFEPP. We used graph-based analyses to characterize internal hydrogen-bond networks that could contribute to the activation of the MOR. We find that fentanyl and NFEPP prefer distinct binding poses and that, in their binding poses, fentanyl and NFEPP partake in distinct internal hydrogen-bond networks, leading to the cytoplasmic G-protein-binding region. Moreover, the protonation state of functionally important aspartic and histidine side chains impacts hydrogen-bond networks that extend throughout the receptor, such that the ligand-bound MOR presents at its cytoplasmic G-protein-binding side, a hydrogen-bonding environment where dynamics depend on whether fentanyl or NFEPP is bound, and on the protonation state of specific MOR groups. The exquisite sensitivity of the internal protein-water hydrogen-bond network to the protonation state and to details of the drug binding could enable the MOR to elicit distinct pH- and opioid-dependent responses at its cytoplasmic G-protein-binding site." @default.
• W4385295265 created "2023-07-28" @default.
• W4385295265 creator A5003060699 @default.
• W4385295265 creator A5032088268 @default.
• W4385295265 creator A5043039841 @default.
• W4385295265 creator A5055790348 @default.
• W4385295265 date "2023-07-27" @default.
• W4385295265 modified "2023-10-16" @default.
• W4385295265 title "Fentanyl and the Fluorinated Fentanyl Derivative NFEPP Elicit Distinct Hydrogen-Bond Dynamics of the Opioid Receptor" @default.
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• W4385295265 doi "https://doi.org/10.1021/acs.jcim.3c00197" @default.
• W4385295265 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37498626" @default.
• W4385295265 hasPublicationYear "2023" @default.
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