1SYI

X-RAY STRUCTURE OF THE Y702F MUTANT OF THE GLUR2 LIGAND-BINDING CORE (S1S2J) IN COMPLEX WITH (S)-CPW399 AT 2.1 A RESOLUTION.

1SYI の概要

• エントリーDOI: 10.2210/pdb1syi/pdb
• 関連するPDBエントリー: 1SYH 1ftj 1ftm 1fw0 1gr2 1m5b 1m5c 1m5e 1mqd 1mqg 1nnp
• 分子名称: Glutamate receptor 2, (S)-2-AMINO-3-(1,3,5,7-PENTAHYDRO-2,4-DIOXO-CYCLOPENTA[E]PYRIMIDIN-1-YL) PROIONIC ACID (3 entities in total)
• 機能のキーワード: ionotropic glutamate receptor glur2, ligand-binding core, agonist complex, mutant, membrane protein
• 由来する生物種: Rattus norvegicus (Norway rat)
• 細胞内の位置: Cell membrane; Multi-pass membrane protein: P19491
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 58889.82

構造登録者

Frandsen, A.,Pickering, D.S.,Vestergaard, B.,Kasper, C.,Nielsen, B.B.,Greenwood, J.R.,Campiani, G.,Gajhede, M.,Schousboe, A.,Kastrup, J.S. (登録日: 2004-04-01, 公開日: 2005-03-22, 最終更新日: 2023-08-23)

主引用文献

Frandsen, A.,Pickering, D.S.,Vestergaard, B.,Kasper, C.,Nielsen, B.B.,Greenwood, J.R.,Campiani, G.,Fattorusso, C.,Gajhede, M.,Schousboe, A.,Kastrup, J.S.
Tyr702 Is an Important Determinant of Agonist Binding and Domain Closure of the Ligand-Binding Core of GluR2.
Mol.Pharmacol., 67:703-713, 2005

PubMed Abstract: Ionotropic glutamate receptors mediate most rapid excitatory synaptic transmission in the mammalian central nervous system, and their involvement in neurological diseases has stimulated widespread interest in their structure and function. Despite a large number of agonists developed so far, few display selectivity among (S)-2-amino-3-(3-hydroxy-5-methylisoxazol-4-yl) propionic acid (AMPA)-receptor subtypes. The present study provides X-ray structures of the glutamate receptor 2 (GluR2)-selective partial agonist (S)-2-amino-3-(1,3,5,6,7-pentahydro-2,4-dioxocyclopenta[e] pyrimidin-1-yl) propanoic acid [(S)-CPW399] in complex with the ligand-binding core of GluR2 (GluR2-S1S2J) and with a (Y702F)GluR2-S1S2J mutant. In addition, the structure of the nonselective partial agonist kainate in complex with (Y702F)GluR2-S1S2J was determined. The results show that the selectivity of (S)-CPW399 toward full-length GluR2 relative to GluR3 is reflected in the binding data on the two soluble constructs, allowing the use of (Y702F)GluR2-S1S2J as a model system for studying GluR2/GluR3 selectivity. Structural comparisons suggest that selectivity arises from disruption of a water-mediated network between ligand and receptor. A D1-D2 domain closure occurs upon agonist binding. (S)-CPW399 and kainate induce greater domain closure in the Y702F mutant, indicating that these partial agonists here act in a manner more reminiscent of full agonists. Both kainate and (S)-CPW399 exhibited higher efficacy at (Y702F)GluR2(Q)i than at wild-type GluR2(Q)i. Whereas an excellent correlation exists between domain closure and efficacy of a range of agonists at full-length GluR2 determined by electrophysiology in Xenopus laevis oocytes, a direct correlation between agonist induced domain closure of (Y702F)GluR2-S1S2J and efficacy at the GluR3 receptor is not observed. Although it clearly controls selectivity, mutation of this residue alone is insufficient to explain agonist-induced conformational rearrangements occurring in this variant.

PubMed: 15591246
DOI: 10.1124/mol.104.002931

実験手法

X-RAY DIFFRACTION (2.1 Å)