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C-2-Linked Dimeric Strychnine Analogues as Bivalent Ligands Targeting Glycine Receptors.
Zlotos, Darius P; Abdelmalek, Carine M; Botros, Liza S; Banoub, Maha M; Mandour, Yasmine M; Breitinger, Ulrike; El Nady, Ahmed; Breitinger, Hans-Georg; Sotriffer, Christoph; Villmann, Carmen; Jensen, Anders A; Holzgrabe, Ulrike.
Afiliação
  • Zlotos DP; Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Biotechnology, The German University in Cairo, New Cairo City, 11835 Cairo, Egypt.
  • Abdelmalek CM; Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Biotechnology, The German University in Cairo, New Cairo City, 11835 Cairo, Egypt.
  • Botros LS; Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Biotechnology, The German University in Cairo, New Cairo City, 11835 Cairo, Egypt.
  • Banoub MM; Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Biotechnology, The German University in Cairo, New Cairo City, 11835 Cairo, Egypt.
  • Mandour YM; Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Biotechnology, The German University in Cairo, New Cairo City, 11835 Cairo, Egypt.
  • Breitinger U; School of Life and Medical Sciences, University of Hertfordshire hosted by Global Academic Foundation, New Administrative Capitol, 11865 Cairo, Egypt.
  • El Nady A; Department of Biochemistry, Faculty of Pharmacy and Biotechnology, The German University in Cairo, New Cairo City, 11835 Cairo, Egypt.
  • Breitinger HG; Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Biotechnology, The German University in Cairo, New Cairo City, 11835 Cairo, Egypt.
  • Sotriffer C; Department of Biochemistry, Faculty of Pharmacy and Biotechnology, The German University in Cairo, New Cairo City, 11835 Cairo, Egypt.
  • Villmann C; Institute of Pharmacy and Food Chemistry, University of Würzburg, 97074 Würzburg, Germany.
  • Jensen AA; Institute of Clinical Neurobiology, University Hospital, University of Würzburg, 97078 Würzburg, Germany.
  • Holzgrabe U; Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, DK-2100 Copenhagen, Denmark.
J Nat Prod ; 84(2): 382-394, 2021 02 26.
Article em En | MEDLINE | ID: mdl-33596384
Strychnine is the prototypic antagonist of glycine receptors, a family of pentameric ligand-gated ion channels. Recent high-resolution structures of homomeric glycine receptors have confirmed the presence of five orthosteric binding sites located in the extracellular subunit interfaces of the receptor complex that are targeted by strychnine. Here, we report the synthesis and extensive pharmacological evaluation of bivalent ligands composed of two strychnine pharmacophores connected by appropriate spacers optimized toward simultaneous binding to two adjacent orthosteric sites of homomeric α1 glycine receptors. In all bivalent ligands, the two strychnine units were linked through C-2 by amide spacers of various lengths ranging from 6 to 69 atoms. Characterization of the compounds in two functional assays and in a radioligand binding assay indicated that compound 11a, with a spacer consisting of 57 atoms, may be capable of bridging the homomeric α1 GlyRs by simultaneous occupation of two adjacent strychnine-binding sites. The findings are supported by docking experiments to the crystal structure of the homomeric glycine receptor. Based on its unique binding mode, its relatively high binding affinity and antagonist potency, and its slow binding kinetics, the bivalent strychnine analogue 11a could be a valuable tool to study the functional properties of glycine receptors.
Assuntos

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Estricnina / Receptores de Glicina Limite: Humans Idioma: En Revista: J Nat Prod Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Egito

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Estricnina / Receptores de Glicina Limite: Humans Idioma: En Revista: J Nat Prod Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Egito