2I3W

Measurement of conformational changes accompanying desensitization in an ionotropic glutamate receptor: Structure of S729C mutant

Summary for 2I3W

• Entry DOI: 10.2210/pdb2i3w/pdb
• Related: 1FTJ 2I3V
• Descriptor: GLUTAMATE RECEPTOR SUBUNIT 2, GLUTAMIC ACID (3 entities in total)
• Functional Keywords: ionotropic glutamate receptor ligand binding core s1s2 g729c mutant, membrane protein
• Biological source: Rattus norvegicus (Norway rat); More
• Cellular location: Cell membrane; Multi-pass membrane protein: P19491
• Total number of polymer chains: 2
• Total formula weight: 58225.23

Authors

Armstrong, N.,Jasti, J.,Beich-Frandsen, M.,Gouaux, E. (deposition date: 2006-08-21, release date: 2006-10-17, Last modification date: 2024-11-13)

Primary citation

Armstrong, N.,Jasti, J.,Beich-Frandsen, M.,Gouaux, E.
Measurement of Conformational Changes accompanying Desensitization in an Ionotropic Glutamate Receptor.
Cell(Cambridge,Mass.), 127:85-97, 2006

PubMed Abstract: The canonical conformational states occupied by most ligand-gated ion channels, and many cell-surface receptors, are the resting, activated, and desensitized states. While the resting and activated states of multiple receptors are well characterized, elaboration of the structural properties of the desensitized state, a state that is by definition inactive, has proven difficult. Here we use electrical, chemical, and crystallographic experiments on the AMPA-sensitive GluR2 receptor, defining the conformational rearrangements of the agonist binding cores that occur upon desensitization of this ligand-gated ion channel. These studies demonstrate that desensitization involves the rupture of an extensive interface between domain 1 of 2-fold related glutamate-binding core subunits, compensating for the ca. 21 degrees of domain closure induced by glutamate binding. The rupture of the domain 1 interface allows the ion channel to close and thereby provides a simple explanation to the long-standing question of how agonist binding is decoupled from ion channel gating upon receptor desensitization.

PubMed: 17018279
DOI: 10.1016/j.cell.2006.08.037

Experimental method

X-RAY DIFFRACTION (2.3 Å)