title: Transformation of Pro-Leu-Gly-NH2 peptidomimetic positive allosteric modulators of the dopamine D2 receptor into negative modulators.
abstract: The synthesis of dimethyl derivatives of 5.6.5 spiro bicyclic lactam Pro-Leu-Gly-NH(2) peptidomimetics was carried out to test the hypothesis that by placing methyl groups on the β-methylene carbon of the thiazolidine ring steric bulk would be introduced into the topological space that the β-methylene carbon is believed to occupy in the negative allosteric modulators of the dopamine D(2) receptor. With such a modification, a positive allosteric modulator would be converted into a negative allosteric modulator. This hypothesis was shown to be correct as 3a and 4a where found to be negative allosteric modulators, whereas their unmethylated derivatives were positive allosteric modulators of the dopamine D(2) receptor.
authors.affiliation: Department of Medicinal Chemistry, University of Minnesota, 308 Harvard Street SE, Minneapolis, Minnesota 55455, United States.
authors.forename: Swapna
authors.initials: S
authors.lastname: Bhagwanth
authors.forename: Satyendra
authors.initials: S
authors.lastname: Mishra
authors.forename: Ritesh
authors.initials: R
authors.lastname: Daya
authors.forename: Jordan
authors.initials: J
authors.lastname: Mah
authors.forename: Ram K
authors.initials: RK
authors.lastname: Mishra
authors.forename: Rodney L
authors.initials: RL
authors.lastname: Johnson
mesh_terms: D000494:Allosteric Regulation / Q000187:drug effects / Q000502:physiology; D000818:Animals; D002417:Cattle; D065127:Dopamine D2 Receptor Antagonists; D004305:Dose-Response Relationship, Drug; D009075:MSH Release-Inhibiting Hormone / Q000737:chemistry* / Q000494:pharmacology; D018716:Molecular Mimicry / Q000187:drug effects* / Q000502:physiology; D057786:Peptidomimetics / Q000737:chemistry* / Q000494:pharmacology; D017448:Receptors, Dopamine D2 / Q000819:agonists* / Q000502:physiology; D013329:Structure-Activity Relationship
chemical_list: D065127:Dopamine D2 Receptor Antagonists; D057786:Peptidomimetics; D017448:Receptors, Dopamine D2; D009075:MSH Release-Inhibiting Hormone