Allosteric Functional Switch of Neurokinin A-Mediated Signaling at the Neurokinin NK2 Receptor: Structural Exploration
作者:Céline Valant、Emeline Maillet、Jean-Jacques Bourguignon、Bernard Bucher、Valérie Utard、Jean-Luc Galzi、Marcel Hibert
DOI:10.1021/jm900671k
日期:2009.10.8
The neurokinin NK2 receptor is known to pre-exist in equilibrium between at least three states: resting-inactive, calcium-triggering, and cAMP-producing. Its endogeneous ligand, NKA, mainly induces the calcium response. Using a FRET-based assay, we have previously discovered an allosteric modulator of the NK2 receptor that has the unique ability to discriminate among the two signaling pathways: calcium-signaling is not affected while CAMP signaling is significantly decreased. A series of compounds have been prepared and studied in order to better understand the structural determinants of this allosteric functional switch of a GPCR. Most of them display the same allosteric profile, with smooth pharmacomodulation. One compound however exhibits significantly improved modulatory properties of NKA induced signaling when compared to the original modulator.