Reassessing the melatonin pharmacophore—Enantiomeric resolution, pharmacological activity, structure analysis, and molecular modeling of a constrained chiral melatonin analogue

3-(Acetylaminomethyl)-2-(ethoxycarbonyl)-6-methoxy-1,3,4,5-tetrahydrobenzo[ cd]indole ( 2) is a rigid melatonin analogue that as a racemate displays about the same affinity and intrinsic activity of melatonin ( 1) in in vitro experiments. We report here the resolution of the racemate by preparative...

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Veröffentlicht in:Bioorganic & medicinal chemistry 2006-05, Vol.14 (10), p.3383-3391
Hauptverfasser: Rivara, Silvia, Diamantini, Giuseppe, Di Giacomo, Barbara, Lamba, Doriano, Gatti, Giuseppe, Lucini, Valeria, Pannacci, Marilou, Mor, Marco, Spadoni, Gilberto, Tarzia, Giorgio
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container_end_page 3391
container_issue 10
container_start_page 3383
container_title Bioorganic & medicinal chemistry
container_volume 14
creator Rivara, Silvia
Diamantini, Giuseppe
Di Giacomo, Barbara
Lamba, Doriano
Gatti, Giuseppe
Lucini, Valeria
Pannacci, Marilou
Mor, Marco
Spadoni, Gilberto
Tarzia, Giorgio
description 3-(Acetylaminomethyl)-2-(ethoxycarbonyl)-6-methoxy-1,3,4,5-tetrahydrobenzo[ cd]indole ( 2) is a rigid melatonin analogue that as a racemate displays about the same affinity and intrinsic activity of melatonin ( 1) in in vitro experiments. We report here the resolution of the racemate by preparative medium pressure liquid chromatography (MPLC) and the X-ray determination of the R absolute configuration of the (−)-enantiomer. The two enantiomers were separately tested as MT 1 and MT 2 ligands, and the (+)-( S)- 2 showed a potency comparable to that of melatonin and about three orders of magnitude greater than that of its enantiomer. The information obtained by crystallographic analysis and NMR studies about the conformational preference for 2 and by the pharmacological characterization of ( R)- 2 and ( S)- 2 was employed in a molecular modeling study, aimed at reassessing the melatonin receptor pharmacophore model for agonist compounds. Chiral enantioselective agonists reported in the literature were also included in the study.
doi_str_mv 10.1016/j.bmc.2005.12.053
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source MEDLINE; Access via ScienceDirect (Elsevier)
subjects 3T3 Cells
Animals
Binding, Competitive - drug effects
Biological and medical sciences
Conformational analysis
Crystallography, X-Ray
Enantiomeric resolution
Magnetic Resonance Spectroscopy
Medical sciences
Melatonin
Melatonin - analogs & derivatives
Melatonin - chemistry
Melatonin - pharmacology
Mice
Models, Molecular
Molecular modeling
Neuropharmacology
Neurotransmitters. Neurotransmission. Receptors
Peptidergic system (neuropeptide, opioid peptide, opiates...). Adenosinergic and purinergic systems
Pharmacology. Drug treatments
Pharmacophore model
Receptors, Melatonin - metabolism
Stereoisomerism
Structure-Activity Relationship
X-ray crystal structure
title Reassessing the melatonin pharmacophore—Enantiomeric resolution, pharmacological activity, structure analysis, and molecular modeling of a constrained chiral melatonin analogue
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