title: Synthesis, molecular modeling studies, and preliminary pharmacological characterization of all possible 2-(2'-sulfonocyclopropyl)glycine stereoisomers as conformationally constrained L-homocysteic acid analogs.
abstract: Bioisosteric replacements of the distal acidic group of L-glutamic acid (L-Glu, 1) and conformational constraining of its carbon skeleton, have been widely exploited to discover competitive modulators of glutamate receptors. Noteworthy, L-homocysteic acid (L-HCA, 18), a neurotransmitter belonging to the class of excitatory sulfur-containing amino acids, may be considered an endogenous occurring bioisoster of L-Glu (1). L-HCA (18) has been reported to mediate signaling between glial cells and postsynaptic neurons through the activation of glutamate receptors and others hitherto not well-characterized receptors. As a continuation of our work in the preparation of conformationally constrained glutamate analogs, we report the synthesis and the preliminary pharmacological characterization at iGluRs and mGluRs of all eight stereoisomers of 2-(2'-sulfonocyclopropyl)glycine (SCGs, 8-15). Among the reported compounds, S-SCG-4 (15) showed to be a potent and relatively selective AMPA ligand. Docking experiments coupled to molecular electrostatic potential calculations allowed insight into the molecular basis of the activity of this compound to be gained. The library of SCGs (8-15), while providing a novel source of modulators of the glutamate receptors, represents a valuable chemical tool to better characterize L-HCA pathways in the CNS.
authors.affiliation: Dipartimento di Chimica e Tecnologia del Farmaco, Università di Perugia, Via del Liceo, 1- 06123 Perugia, Italy. rp@unipg.it
authors.forename: Roberto
authors.initials: R
authors.lastname: Pellicciari
authors.forename: Maura
authors.initials: M
authors.lastname: Marinozzi
authors.forename: Antonio
authors.initials: A
authors.lastname: Macchiarulo
authors.forename: Maria Carmela
authors.initials: MC
authors.lastname: Fulco
authors.forename: Julia
authors.initials: J
authors.lastname: Gafarova
authors.forename: Michaela
authors.initials: M
authors.lastname: Serpi
authors.forename: Gianluca
authors.initials: G
authors.lastname: Giorgi
authors.forename: Søren
authors.initials: S
authors.lastname: Nielsen
authors.forename: Christian
authors.initials: C
authors.lastname: Thomsen
mesh_terms: D000818:Animals; D001921:Brain / Q000378:metabolism; D002460:Cell Line; D006224:Cricetinae; D018360:Crystallography, X-Ray; D003521:Cyclopropanes / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D005998:Glycine / Q000031:analogs & derivatives* / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D006710:Homocysteine / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D066298:In Vitro Techniques; D008958:Models, Molecular; D008968:Molecular Conformation; D025341:Principal Component Analysis; D051381:Rats; D018091:Receptors, AMPA / Q000378:metabolism; D018092:Kainic Acid Receptors / Q000378:metabolism; D018094:Receptors, Metabotropic Glutamate / Q000378:metabolism; D016194:Receptors, N-Methyl-D-Aspartate / Q000378:metabolism; D013237:Stereoisomerism; D013329:Structure-Activity Relationship; D013450:Sulfones / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D013816:Thermodynamics
chemical_list: D003521:Cyclopropanes; D005998:Glycine; D006710:Homocysteine; D018091:Receptors, AMPA; D018092:Kainic Acid Receptors; D018094:Receptors, Metabotropic Glutamate; D016194:Receptors, N-Methyl-D-Aspartate; D013450:Sulfones; C007956:homocysteic acid