Biostructural and pharmacological studies of bicyclic analogues of the 3-isoxazolol glutamate receptor agonist ibotenic acid.Frydenvang, K., Pickering, D.S., Greenwood, J.R., Krogsgaard-Larsen, N., Brehm, L., Nielsen, B., Vogensen, S.B., Hald, H., Kastrup, J.S., Krogsgaard-Larsen, P., Clausen, R.P.
(2010) J. Med. Chem. 53: 8354-8361
- PubMed: 21067182
- DOI: 10.1021/jm101218a
- Primary Citation of Related Structures:
- PubMed Abstract:
- Mechanisms for activation and antagonism of an AMPA-sensitive glutamate receptor: crystal structures of the GluR2 ligand binding core.
Armstrong, N.,Gouaux, E.
(2000) Neuron 28: 165
- Structural basis for AMPA receptor activation and ligand selectivity: crystal structures of five agonist complexes with the GluR2 ligand-binding core.
Hogner, A.,Kastrup, J.S.,Jin, R.,Liljefors, T.,Mayer, M.L.,Egebjerg, J.,Larsen, I.K.,Gouaux, E.
(2002) J.Mol.Biol. 322: 93
We describe an improved synthesis and detailed pharmacological characterization of the conformationally restricted analogue of the naturally occurring nonselective glutamate receptor agonist ibotenic acid (RS)-3-hydroxy-4,5,6,7-tetrahydroisoxazolo[5, ...
We describe an improved synthesis and detailed pharmacological characterization of the conformationally restricted analogue of the naturally occurring nonselective glutamate receptor agonist ibotenic acid (RS)-3-hydroxy-4,5,6,7-tetrahydroisoxazolo[5,4-c]pyridine-7-carboxylic acid (7-HPCA, 5) at AMPA receptor subtypes. Compound 5 was shown to be a subtype-discriminating agonist at AMPA receptors with higher binding affinity and functional potency at GluA1/2 compared to GluA3/4, unlike the isomeric analogue (RS)-3-hydroxy-4,5,6,7-tetrahydroisoxazolo[5,4-c]pyridine-5-carboxylic acid (5-HPCA, 4) that binds to all AMPA receptor subtypes with comparable potency. Biostructural X-ray crystallographic studies of 4 and 5 reveal different binding modes of (R)-4 and (S)-5 in the GluA2 agonist binding domain. WaterMap analysis of the GluA2 and GluA4 binding pockets with (R)-4 and (S)-5 suggests that the energy of hydration sites is ligand dependent, which may explain the observed selectivity.
Department of Medicinal Chemistry.