Three-dimensional models of glutamate receptors

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Michael J. Sutcliffe, Allister H. Smeeton, Z Galen Wo and Robert E. Oswald


Abstract

Structural models of glutamate receptors have been produced as part of a multidisciplinary study of neuronal function—both ligand/receptor interactions and ion transport—at the atomic level. The models have concentrated on the agonist binding and transmembrane domains of ionotropic (i.e. ligand-gated) glutamate receptors (iGluRs), and have aided our understanding of the molecular determinants of (1) ligand binding and (2) channel activity. The model building process involved a combination of homology modelling, distance geometry, molecular mechanics, protein–ligand and protein–protein docking, electrostatic calculations and manual adjustment, in conjunction with restraints from site-directed mutagenesis, ligand binding and electrophysiological studies. The initial models were used to produce hypotheses which were tested experimentally; these models have been subsequently refined as part of an extremely effective multidisciplinary study using an iterative molecular modelling/experimental verification cycle in which restraints derived from experimental studies are used at all stages, and the findings from one round of modelling are used as restraints in the next. By studying a variety of agonists and antagonists, details have been built up of (1) those residues involved in ligand binding and (2) the role of agonist binding (i.e. agonist-induced conformational change) in channel gating. The models also aid our understanding of the conductance properties of the channels.


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