The interaction of new bivalent NOP receptor antagonists with dodecyl phosphatidylcholine micelles and DMPC/cholesterol liposomes was investigated in solution by high resolution NMR. The ligands are structurally related to the NOP antagonist JTC-801 plus a propanediamine or heptanediamine spacer between the pharmacophoric units. Ligand internuclear distances were derived from 2D NOESY data and applied to molecular modelling calculations as conformational restraints. NMR experiments on micelles evidenced that the ligands closely approached the micelles but gave no hints on the preferential conformations of the interacting ligands. Results from NMR experiments in the presence of liposomes clearly indicated that both ligands strongly interacted with the bilayer assuming a preferential folded conformation with the quinoline arms superimposing on each other. The finding suggested that these strongly lipophilic pharmacophores could localize in the native receptorial membrane in the form of a depot, gaining access to the recognition site via the lipid bilayer. (C) 2010 Elsevier Inc. All rights reserved.
High resolution NMR conformational studies of new bivalent NOP receptor antagonists in model membrane systems / Anna, Borioni; Giuditta, Bastanzio; Delfini, Maurizio; Carlo, Mustazza; Sciubba, Fabio; Massimo, Tatti; M. R., Del Giudice. - In: BIOORGANIC CHEMISTRY. - ISSN 0045-2068. - STAMPA. - 39:1(2011), pp. 59-66. [10.1016/j.bioorg.2010.12.001]
High resolution NMR conformational studies of new bivalent NOP receptor antagonists in model membrane systems
DELFINI, Maurizio;SCIUBBA, FABIO;
2011
Abstract
The interaction of new bivalent NOP receptor antagonists with dodecyl phosphatidylcholine micelles and DMPC/cholesterol liposomes was investigated in solution by high resolution NMR. The ligands are structurally related to the NOP antagonist JTC-801 plus a propanediamine or heptanediamine spacer between the pharmacophoric units. Ligand internuclear distances were derived from 2D NOESY data and applied to molecular modelling calculations as conformational restraints. NMR experiments on micelles evidenced that the ligands closely approached the micelles but gave no hints on the preferential conformations of the interacting ligands. Results from NMR experiments in the presence of liposomes clearly indicated that both ligands strongly interacted with the bilayer assuming a preferential folded conformation with the quinoline arms superimposing on each other. The finding suggested that these strongly lipophilic pharmacophores could localize in the native receptorial membrane in the form of a depot, gaining access to the recognition site via the lipid bilayer. (C) 2010 Elsevier Inc. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
