4nf6
From Proteopedia
Crystal structure of GluN1/GluN2A ligand-binding domain in complex with glycine and PPDA
Structural highlights
Function[NMDZ1_RAT] NMDA receptor subtype of glutamate-gated ion channels possesses high calcium permeability and voltage-dependent sensitivity to magnesium. Mediated by glycine. Plays a key role in synaptic plasticity, synaptogenesis, excitotoxicity, memory acquisition and learning. It mediates neuronal functions in glutamate neurotransmission. Is involved in the cell surface targeting of NMDA receptors.[1] [NMDE1_RAT] NMDA receptor subtype of glutamate-gated ion channels possesses high calcium permeability and voltage-dependent sensitivity to magnesium. Activation requires binding of agonist to both types of subunits. Publication Abstract from PubMedThere has been a great level of enthusiasm to downregulate overactive N-methyl-D-aspartate (NMDA) receptors to protect neurons from excitotoxicity. NMDA receptors play pivotal roles in basic brain development and functions as well as in neurological disorders and diseases. However, mechanistic understanding of antagonism in NMDA receptors is limited due to complete lack of antagonist-bound structures for the L-glutamate-binding GluN2 subunits. Here, we report the crystal structures of GluN1/GluN2A NMDA receptor ligand-binding domain (LBD) heterodimers in complex with GluN1- and GluN2-targeting antagonists. The crystal structures reveal that the antagonists, D-(-)-2-amino-5-phosphonopentanoic acid (D-AP5) and 1-(phenanthrene-2-carbonyl)piperazine-2,3-dicarboxylic acid (PPDA), have discrete binding modes and mechanisms for opening of the bilobed architecture of GluN2A LBD compared to the agonist-bound form. The current study shows distinct ways by which the conformations of NMDA receptor LBDs may be controlled and coupled to receptor inhibition and provides possible strategies to develop therapeutic compounds with higher subtype-specificity. Structural insights into competitive antagonism in NMDA receptors.,Jespersen A, Tajima N, Fernandez-Cuervo G, Garnier-Amblard EC, Furukawa H Neuron. 2014 Jan 22;81(2):366-78. doi: 10.1016/j.neuron.2013.11.033. PMID:24462099[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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