Conformational constraint of mammalian, chicken, and salmon GnRHs, but not GnRH II, enhances binding at mammalian and nonmammalian receptors: evidence for preconfiguration of GnRH II.

Abstract excerpt

Mammalian GnRH (mGnRH) is believed to interact with mGnRH type I receptors in a beta-II' turn conformation involving residues 5-8. This conformation can be constrained by substitution of a D-amino acid at position 6 or by a lactam ring involving residues 6 and 7, thereby increasing receptor binding affinity. It has been proposed that this is not the case for non-mGnRH receptors. However, we show that this...

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