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• W2000457364 endingPage "10313" @default.
• W2000457364 startingPage "10305" @default.
• W2000457364 abstract "Molecular modeling showed interactions of Tyr (290(6.58)) in transmembrane domain 6 of the GnRH receptor with Tyr (5) of GnRH I, and His (5) of GnRH II. The wild-type receptor exhibited high affinity for [Phe (5)]GnRH I and [Tyr (5)]GnRH II, but 127- and 177-fold decreased affinity for [Ala (5)]GnRH I and [Ala (5)]GnRH II, indicating that the aromatic ring in position 5 is crucial for receptor binding. The receptor mutation Y290F decreased affinity for GnRH I, [Phe (5)]GnRH I, GnRH II and [Tyr (5)]GnRH II, while Y290A and Y290L caused larger decreases, suggesting that both the para-OH and aromatic ring of Tyr (290(6.58)) are important for binding of ligands with aromatic residues in position 5. Mutating Tyr (290(6.58)) to Gln increased affinity for Tyr (5)-containing GnRH analogues 3-12-fold compared with the Y290A and Y290L mutants, suggesting a hydrogen-bond between Gln of the Y290Q mutant and Tyr (5) of GnRH analogues. All mutations had small effects on affinity of GnRH analogues that lack an aromatic residue in position 5. These results support direct interactions of the Tyr (290(6.58)) side chain with Tyr (5) of GnRH I and His (5) of GnRH II. Tyr (290(6.58)) mutations, except for Y290F, caused larger decreases in GnRH potency than affinity, indicating that an aromatic ring is important for the agonist-induced receptor conformational switch." @default.
• W2000457364 created "2016-06-24" @default.
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• W2000457364 date "2008-09-05" @default.
• W2000457364 modified "2023-09-27" @default.
• W2000457364 title "Identification of Tyr^290(6.58) of the Human Gonadotropin-Releasing Hormone (GnRH) Receptor as a Contact Residue for Both GnRH I and GnRH II: Importance for High-Affinity Binding and Receptor Activation" @default.
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• W2000457364 doi "https://doi.org/10.1021/bi800911z" @default.
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