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• W2273454618 abstract "The tight complexes FKBP12 forms with immunosuppressive drugs, such as FK506 and rapamycin, are frequently used as models for developing approaches to structure-based drug design. Although the interfaces between FKBP12 and these ligands are well-defined structurally and are almost identical in the X-ray crystallographic structures of various complexes, our nuclear magnetic resonance studies have revealed the existence of substantial large-amplitude motions in the FKBP12-ligand interfaces that depend on the nature of the ligand. We have monitored these motions by measuring the rates of Tyr and Phe aromatic ring flips, and hydroxyl proton exchange for residues clustered within the FKBP12-ligand interface. The results show that the rates of hydroxyl proton exchange and ring flipping for Tyr26 are much slower in the FK506 complex than in the rapamycin complex, whereas the rates of ring flipping for Phe48 and Phe99 are significantly faster in the FK506 complex than in the rapamycin complex. The apparent rate differences observed for the interfacial aromatic residues in the two complexes confirm that these dynamic processes occur without ligand dissociation. We tentatively attribute the differential interface dynamics for these complexes to a single hydrogen bond between the ζ-hydrogen of Phe46 and the C32 carbonyl oxygen of rapamycin, which is not present in the KF506 complex. This newly identified Phe46 ζ-hydrogen bond in the rapamycin complex imposes motional restriction on the surrounding hydrophobic cluster and subsequently regulates the dynamics within the protein-ligand interface. Such information concerning large-amplitude dynamics at drug-target interfaces has the potential to provide novel clues for drug design." @default.
• W2273454618 created "2016-06-24" @default.
• W2273454618 creator A5028270746 @default.
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• W2273454618 creator A5062794397 @default.
• W2273454618 creator A5068049306 @default.
• W2273454618 creator A5076485810 @default.
• W2273454618 date "2015-11-18" @default.
• W2273454618 modified "2023-10-14" @default.
• W2273454618 title "Differential Large-Amplitude Breathing Motions in the Interface of FKBP12–Drug Complexes" @default.
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• W2273454618 doi "https://doi.org/10.1021/acs.biochem.5b00820" @default.
• W2273454618 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26561008" @default.
• W2273454618 hasPublicationYear "2015" @default.
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