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Use of the 4-Hydroxytriazole Moiety as a Bioisosteric Tool in the Development of Ionotropic Glutamate Receptor Ligands

  • Stefano Sainas
  • , Piero Temperini
  • , Jill C. Farnsworth
  • , Feng Yi
  • , Stine Møllerud
  • , Anders A. Jensen
  • , Birgitte Nielsen
  • , Alice Passoni
  • , Jette S. Kastrup
  • , Kasper B. Hansen
  • , Donatella Boschi
  • , Darryl S. Pickering
  • , Rasmus P. Clausen
  • , Marco L. Lolli

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

We report a series of glutamate and aspartate analogues designed using the hydroxy-1,2,3-triazole moiety as a bioisostere for the distal carboxylic acid. Compound 6b showed unprecedented selectivity among (S)-2-amino-3-(3-hydroxy-5-methyl-4-isoxazolyl)propionic acid (AMPA) receptor subtypes, confirmed also by an unusual binding mode observed for the crystal structures in complex with the AMPA receptor GluA2 agonist-binding domain. Here, a methionine (Met729) was highly disordered compared to previous agonist-bound structures. This observation provides a possible explanation for the pharmacological profile. In the structure with 7a, an unusual organization of water molecules around the bioisostere arises compared to previous structures of ligands with other bioisosteres. Aspartate analogue 8 with the hydroxy-1,2,3-triazole moiety directly attached to glycine was unexpectedly able to activate both the glutamate and glycine agonist-binding sites of the N-methyl-d-aspartic acid receptor. These observations demonstrate novel features that arise when employing a hydroxytriazole moiety as a bioisostere for the distal carboxylic acid in glutamate receptor agonists.

Original languageEnglish
Pages (from-to)4467-4482
Number of pages16
JournalJournal of Medicinal Chemistry
Volume62
Issue number9
DOIs
StatePublished - May 9 2019

Funding

This research was supported by funds from the University of Turin, Ricerca Locale 2016/2017 (grant nos LOLM_RI-LO_17_01, BOSD_RILO_17_01), Ministero dell’Istruzione, dell’Università e della Ricerca PRIN 2015 (LOLM_-PRIN_2015_16_01), the Lundbeck Foundation. (P.T., S.M., and J.S.K.), Danscatt (S.M., J.S.K., D.S.P.), and by the NIH (GM103546 and NS097536) to K.B.H. We wish to thank Dr. Livio Stevanato for performing all of the NMR experiments and for instrument maintenance and Heidi Peterson for help with expression, purification, and crystallization. We wish to thank beamline scientists at BioMAX, MAXIV, Lund, Sweden, for excellent support during data collections. This research was supported by funds from the University of Turin, Ricerca Locale 2016/2017 (grant nos LOLM-RILO-17-01, BOSD-RILO-17-01), Ministero dell'Istruzione, dell'Universit? e della Ricerca PRIN 2015 (LOLM-PRIN-2015-16-01), the Lundbeck Foundation. (P.T., S.M., and J.S.K.), Danscatt (S.M., J.S.K., D.S.P.), and by the NIH (GM103546 and NS097536) to K.B.H. We wish to thank Dr. Livio Stevanato for performing all of the NMR experiments and for instrument maintenance and Heidi Peterson for help with expression, purification, and crystallization. We wish to thank beamline scientists at BioMAX, MAXIV, Lund, Sweden, for excellent support during data collections.

Funder number
PRIN 2015
LOLM_-PRIN_2015_16_01
2016/2017
GM103546
R01NS097536
LOLM_RI-LO_17_01, BOSD_RILO_17_01

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