| Structural highlights
5tq0 is a 4 chain structure with sequence from Mus musculus, Rattus norvegicus and Xenopus laevis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
| | Method: | X-ray diffraction, Resolution 2.7Å |
| Ligands: | GOL, IPA, NAG, SO4 |
| Resources: | FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT |
Function
NMDZ1_XENLA Component of NMDA receptor complexes that function as heterotetrameric, ligand-gated ion channels with high calcium permeability and voltage-dependent sensitivity to magnesium. Channel activation requires binding of the neurotransmitter glutamate to the epsilon subunit, glycine binding to the zeta subunit, plus membrane depolarization to eliminate channel inhibition by Mg(2+) (PubMed:16214956, PubMed:19524674, PubMed:21677647, PubMed:25008524, PubMed:26912815, PubMed:27135925, Ref.11, PubMed:28232581). Sensitivity to glutamate and channel kinetics depend on the subunit composition (Probable).[1] [2] [3] [4] [5] [6] [7] [PDB:5IOV]
Publication Abstract from PubMed
Zinc is vastly present in the mammalian brain and controls functions of various cell surface receptors to regulate neurotransmission. A distinctive characteristic of N-methyl-D-aspartate (NMDA) receptors containing a GluN2A subunit is that their ion channel activity is allosterically inhibited by a nano-molar concentration of zinc that binds to an extracellular domain called an amino-terminal domain (ATD). Despite physiological importance, the molecular mechanism underlying the high-affinity zinc inhibition has been incomplete because of the lack of a GluN2A ATD structure. Here we show the first crystal structures of the heterodimeric GluN1-GluN2A ATD, which provide the complete map of the high-affinity zinc-binding site and reveal distinctive features from the ATD of the GluN1-GluN2B subtype. Perturbation of hydrogen bond networks at the hinge of the GluN2A bi-lobe structure affects both zinc inhibition and open probability, supporting the general model in which the bi-lobe motion in ATD regulates the channel activity in NMDA receptors.
Molecular Basis for Subtype Specificity and High-Affinity Zinc Inhibition in the GluN1-GluN2A NMDA Receptor Amino-Terminal Domain.,Romero-Hernandez A, Simorowski N, Karakas E, Furukawa H Neuron. 2016 Dec 21;92(6):1324-1336. doi: 10.1016/j.neuron.2016.11.006. Epub 2016, Dec 1. PMID:27916457[8]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Schmidt C, Werner M, Hollmann M. Revisiting the postulated "unitary glutamate receptor": electrophysiological and pharmacological analysis in two heterologous expression systems fails to detect evidence for its existence. Mol Pharmacol. 2006 Jan;69(1):119-29. doi: 10.1124/mol.105.016840. Epub 2005 Oct , 7. PMID:16214956 doi:https://dx.doi.org/10.1124/mol.105.016840
- ↑ Schmidt C, Hollmann M. Molecular and functional characterization of Xenopus laevis N-methyl-d-aspartate receptors. Mol Cell Neurosci. 2009 Oct;42(2):116-27. doi: 10.1016/j.mcn.2009.06.004. Epub, 2009 Jun 12. PMID:19524674 doi:https://dx.doi.org/10.1016/j.mcn.2009.06.004
- ↑ Karakas E, Simorowski N, Furukawa H. Subunit arrangement and phenylethanolamine binding in GluN1/GluN2B NMDA receptors. Nature. 2011 Jun 15;475(7355):249-53. doi: 10.1038/nature10180. PMID:21677647 doi:10.1038/nature10180
- ↑ Lee CH, Lu W, Michel JC, Goehring A, Du J, Song X, Gouaux E. NMDA receptor structures reveal subunit arrangement and pore architecture. Nature. 2014 Jul 10;511(7508):191-7. doi: 10.1038/nature13548. Epub 2014 Jun 22. PMID:25008524 doi:https://dx.doi.org/10.1038/nature13548
- ↑ Stroebel D, Buhl DL, Knafels JD, Chanda PK, Green M, Sciabola S, Mony L, Paoletti P, Pandit J. A novel binding mode reveals two distinct classes of NMDA receptor GluN2B-selective antagonists. Mol Pharmacol. 2016 Feb 24. pii: mol.115.103036. PMID:26912815 doi:https://dx.doi.org/10.1124/mol.115.103036
- ↑ Tajima N, Karakas E, Grant T, Simorowski N, Diaz-Avalos R, Grigorieff N, Furukawa H. Activation of NMDA receptors and the mechanism of inhibition by ifenprodil. Nature. 2016 May 2. doi: 10.1038/nature17679. PMID:27135925 doi:https://dx.doi.org/10.1038/nature17679
- ↑ Lu W, Du J, Goehring A, Gouaux E. Cryo-EM structures of the triheteromeric NMDA receptor and its allosteric modulation. Science. 2017 Feb 23. pii: eaal3729. doi: 10.1126/science.aal3729. PMID:28232581 doi:https://dx.doi.org/10.1126/science.aal3729
- ↑ Romero-Hernandez A, Simorowski N, Karakas E, Furukawa H. Molecular Basis for Subtype Specificity and High-Affinity Zinc Inhibition in the GluN1-GluN2A NMDA Receptor Amino-Terminal Domain. Neuron. 2016 Dec 21;92(6):1324-1336. doi: 10.1016/j.neuron.2016.11.006. Epub 2016, Dec 1. PMID:27916457 doi:https://dx.doi.org/10.1016/j.neuron.2016.11.006
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