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2al4

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[[Image:2al4.gif|left|200px]]
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{{STRUCTURE_2al4| PDB=2al4 | SCENE= }}
{{STRUCTURE_2al4| PDB=2al4 | SCENE= }}
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'''CRYSTAL STRUCTURE OF THE GLUR2 LIGAND BINDING CORE (S1S2J) IN COMPLEX WITH quisqualate and CX614.'''
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===CRYSTAL STRUCTURE OF THE GLUR2 LIGAND BINDING CORE (S1S2J) IN COMPLEX WITH quisqualate and CX614.===
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==Overview==
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Ligand-gated ion channels involved in the modulation of synaptic strength are the AMPA, kainate, and NMDA glutamate receptors. Small molecules that potentiate AMPA receptor currents relieve cognitive deficits caused by neurodegenerative diseases such as Alzheimer's disease and show promise in the treatment of depression. Previously, there has been limited understanding of the molecular mechanism of action for AMPA receptor potentiators. Here we present cocrystal structures of the glutamate receptor GluR2 S1S2 ligand-binding domain in complex with aniracetam [1-(4-methoxybenzoyl)-2-pyrrolidinone] or CX614 (pyrrolidino-1,3-oxazino benzo-1,4-dioxan-10-one), two AMPA receptor potentiators that preferentially slow AMPA receptor deactivation. Both potentiators bind within the dimer interface of the nondesensitized receptor at a common site located on the twofold axis of molecular symmetry. Importantly, the potentiator binding site is adjacent to the "hinge" in the ligand-binding core "clamshell" that undergoes conformational rearrangement after glutamate binding. Using rapid solution exchange, patch-clamp electrophysiology experiments, we show that point mutations of residues that interact with potentiators in the cocrystal disrupt potentiator function. We suggest that the potentiators slow deactivation by stabilizing the clamshell in its closed-cleft, glutamate-bound conformation.
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(as it appears on PubMed at http://www.pubmed.gov), where 16192394 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16192394}}
==About this Structure==
==About this Structure==
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[[Category: Quisqualate]]
[[Category: Quisqualate]]
[[Category: S1s2]]
[[Category: S1s2]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 19:10:49 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 18:40:25 2008''

Revision as of 15:40, 28 July 2008

Image:2al4.png

Template:STRUCTURE 2al4

CRYSTAL STRUCTURE OF THE GLUR2 LIGAND BINDING CORE (S1S2J) IN COMPLEX WITH quisqualate and CX614.

Template:ABSTRACT PUBMED 16192394

About this Structure

2AL4 is a Single protein structure of sequence from Rattus norvegicus. Full crystallographic information is available from OCA.

Reference

Mechanism of positive allosteric modulators acting on AMPA receptors., Jin R, Clark S, Weeks AM, Dudman JT, Gouaux E, Partin KM, J Neurosci. 2005 Sep 28;25(39):9027-36. PMID:16192394

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