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Identification and Mechanism of Action of Two Histidine Residues Underlying High-Affinity Zn2+ Inhibition of the NMDA Receptor
Open accessAbstract
Zinc (Zn2+) inhibition of N-methyl-D-aspartate receptor (NMDAR) activity involves both voltage-independent and voltage-dependent components. Recombinant NR1/NR2A and NR1/NR2B receptors exhibit similar voltage-dependent block, but voltage-independent Zn2+ inhibition occurs with much higher affinity for NR1/NR2A than NR1/NR2B receptors (nanomolar versus micromolar IC50, respectively). Here, we show that two neighboring histidine residues on NR2A represent the critical determinant (termed the "short spacer") for high-affinity, voltage-independent Zn2+ inhibition using the Xenopus oocyte expression system and site-directed mutagenesis. Mutation of either one of these two histidine residues (H42 and H44) in the extracellular N-terminal domain of NR2A shifted the IC50 for high-affinity Zn2+ inhibition approximately 200-fold without affecting the EC50 of the coagonists NMDA and glycine. We suggest that the mechanism of high-affinity Zn2+ inhibition on the NMDAR involves enhancement of proton inhibition.
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“Of note, even transient GSH deficits are sufficient to induce NMDAR hypofunction 70 .”
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Metadata
- Authors
- Choi, Y.-B., & Lipton, S. A.
- Affiliations
- Brigham and Women's Hospital (US)
- Corresponding author
- Lipton, Stuart A
- Venue
- Neuron
- Publisher
- Elsevier BV
- Published
- 1999-05
- Volume
- 23
- Issue
- 1
- Pages
- 171-180
- ISSN
- 0896-6273 (ISSN-L)
- OpenAlex
- W1970564284
- Cited by
- 180
- References
- 48
- Citations by year
- 2025: 2 · 2024: 1 · 2022: 4 · 2021: 2 · 2020: 4 · 2019: 3 · 2018: 7 · 2017: 4 · 2016: 8 · 2015: 5 · 2014: 10 · 2013: 4 · 2012: 12
- FWCI
- 3.71
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Neuron (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institutes of Health
- National Eye Institute (R01EY005477)
- Eunice Kennedy Shriver National Institute of Child Health and Human Development (P01HD029587)
- Topics
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Amino Acid Enzymes and Metabolism
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Receptor Mechanisms and Signaling
- Keywords
- zinc inhibition, NMDA receptor, NR2A subunit, histidine residues, voltage-dependent block, proton inhibition, site-directed mutagenesis
- MeSH terms
- Animals, Diethyl Pyrocarbonate, Female, Histidine, Mutation, Oocytes, Xenopus laevis, Zinc, Receptors, N-Methyl-D-Aspartate, Patch-Clamp Techniques, Protein Isoforms
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