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Structural elements of a pH-sensitive inhibitor binding site in NMDA receptors
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Structural elements of a pH-sensitive inhibitor binding site in NMDA receptors
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Journal Article
Structural elements of a pH-sensitive inhibitor binding site in NMDA receptors
2019
Overview
Context-dependent inhibition of
N
-methyl-D-aspartate (NMDA) receptors has important therapeutic implications for the treatment of neurological diseases that are associated with altered neuronal firing and signaling. This is especially true in stroke, where the proton concentration in the afflicted area can increase by an order of magnitude. A class of allosteric inhibitors, the 93-series, shows greater potency against GluN1-GluN2B NMDA receptors in such low pH environments, allowing targeted therapy only within the ischemic region. Here we map the 93-series compound binding site in the GluN1-GluN2B NMDA receptor amino terminal domain and show that the interaction of the N-alkyl group with a hydrophobic cage of the binding site is critical for pH-dependent inhibition. Mutation of residues in the hydrophobic cage alters pH-dependent potency, and remarkably, can convert inhibitors into potentiators. Our study provides a foundation for the development of highly specific neuroprotective compounds for the treatment of neurological diseases.
Context-dependent inhibition of NMDA receptors has important therapeutic implications for treatment of neurological diseases. Here, the authors use structural biology and biophysics to describe the basis for pH-dependent inhibition for a class of allosteric NMDAR inhibitors, called the 93-series.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
/ 9/74
/ Animals
/ Cages
/ Glutamic acid receptors (ionotropic)
/ Humanities and Social Sciences
/ Humans
/ INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
/ Ion channels in the nervous system
/ Ischemia
/ Mutation
/ N-Methyl-D-aspartic acid receptors
/ Neuroprotective Agents - chemistry
/ Neuroprotective Agents - pharmacology
/ Oocytes
/ Propanolamines - pharmacology
/ Rats
/ Receptors, N-Methyl-D-Aspartate - antagonists & inhibitors
/ Receptors, N-Methyl-D-Aspartate - chemistry
/ Science
/ Stroke
