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Birgitte Holst, Thomas M Frimurer, Jacek Mokrosinski, Tine Halkjaer, Karina B Cullberg, Christina R Underwood, Thue W Schwartz
A library of robust ghrelin receptor mutants with single substitutions at 22 positions in the main ligand-binding pocket was employed to map binding sites for six different agonists: two peptides (the 28-amino-acid octanoylated endogenous ligand ghrelin and the hexapeptide growth hormone secretagogue GHRP-6) plus four nonpeptide agonists-the original benzolactam L-692,429 [3-amino-3-methyl-N-(2,3,4,5-tetrahydro-2-oxo-1-([2'-(1H-tetrazol-5-yl) (1,1'-biphenyl)-4-yl]methyl)-1H-1-benzazepin-3(R)-yl)-butanamide], the spiroindoline sulfonamide MK-677 [N-[1(R)-1, 2-dihydro-1-ethanesulfonylspiro-3H-indole-3,4'-piperidin)-1'-yl]carbonyl-2-(phenylmethoxy)-ethyl-2-amino-2-methylpropanamide], and two novel oxindole derivatives, SM-130686 [(+)-6-carbamoyl-3-(2-chlorophenyl)-(2-diethylaminoethyl)-4-trifluoromethyloxindole] and SM-157740 [(+/-)-6-carbamoyl-3-(2, 4-dichlorophenyl)-(2-diethylaminoethyl)-4-trifluoromethyloxindole)]...
January 2009: Molecular Pharmacology
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