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The first crystal structure of an ionotropic glutamate receptor ligand-binding core 

The first crystal structure of an ionotropic glutamate receptor ligand-binding core
Chapter:
The first crystal structure of an ionotropic glutamate receptor ligand-binding core
Author(s):

Ke Ren

, and Ronald Dubner

DOI:
10.1093/med/9780198834359.003.0032
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date: 24 October 2020

The known functional ionotropic glutamate receptors (iGluRs) are composed of three major subtypes: AMPA, NMDA, and kainate. In 1998, in the landmark paper discussed in this chapter, Armstrong et al. provided the first crystal structure of an iGluR-subunit ligand-binding core, the S1S2 region of the rat GluA2 ‘flop’ isoform. They solved its structure with X-ray crystallography from selenomethonine crystals. They also identified residues involved in kainate binding, analysed allosteric sites that regulate affinity and specificity of the agonist, and mapped potential subunit–subunit interaction sites. They also proposed that binding of different agonists may result in variable degrees of domain closure. This work has profound impact on the field and it has been importantly cited. Subsequently, numerous high-resolution crystal structures of ligand-binding domains of iGluRs in complex with ligands, both agonists and antagonists, have been solved.

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