Article ID Journal Published Year Pages File Type
2030936 Trends in Biochemical Sciences 2015 10 Pages PDF
Abstract

•Structures of the AMPAR and kainate receptor in multiple states are now available.•These structures show how non-NMDAR iGluRs move to mediate defined functions.•Structures of GluN1/GluN2B show NMDARs and non-NMDARs have distinct architectures.•Despite efforts, a bona fide ‘open channel’ structure remains to be observed.

Ionotropic glutamate receptors (iGluRs) are ligand-gated ion channels that mediate excitatory neurotransmission crucial for brain development and function, including learning and memory formation. Recently a wealth of structural studies on iGluRs including AMPA receptors (AMPARs), kainate receptors, and NMDA receptors (NMDARs) became available. These studies showed structures of non-NMDARs including AMPAR and kainate receptor in various functional states, thereby providing the first visual sense of how non-NMDAR iGluRs may function in the context of homotetramers. Furthermore, they provided the first view of heterotetrameric NMDAR ion channels, and this illuminated the similarities with and differences from non-NMDARs, thus raising a mechanistic distinction between the two groups of iGluRs. We review mechanistic insights into iGluR functions gained through structural studies of multiple groups.

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