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Proton-triggered rearrangement of the AMPA receptor N-terminal domains impacts receptor kinetics and synaptic localization
J. Ivica, N. Kejzar, H. Ho, I. Stockwell, V. Kuchtiak, AM. Scrutton, T. Nakagawa, IH. Greger
Language English Country United States
Document type Journal Article
Grant support
S10 OD032234
NIH HHS - United States
Wellcome Trust - United Kingdom
S10 OD030292
NIH HHS - United States
R01 MH123474
NIMH NIH HHS - United States
R56 MH123474
NIMH NIH HHS - United States
NLK
ProQuest Central
from 2004-01-01 to 1 year ago
Health & Medicine (ProQuest)
from 2004-01-01 to 1 year ago
- MeSH
- Receptors, AMPA * metabolism chemistry MeSH
- Cryoelectron Microscopy * MeSH
- Hippocampus metabolism MeSH
- Kinetics MeSH
- Hydrogen-Ion Concentration MeSH
- Protein Conformation MeSH
- Humans MeSH
- Mice MeSH
- Synaptic Transmission MeSH
- Protein Domains MeSH
- Protons * MeSH
- Molecular Dynamics Simulation * MeSH
- Synapses * metabolism MeSH
- Animals MeSH
- Check Tag
- Humans MeSH
- Mice MeSH
- Animals MeSH
- Publication type
- Journal Article MeSH
AMPA glutamate receptors (AMPARs) are ion channel tetramers that mediate the majority of fast excitatory synaptic transmission. They are composed of four subunits (GluA1-GluA4); the GluA2 subunit dominates AMPAR function throughout the forebrain. Its extracellular N-terminal domain (NTD) determines receptor localization at the synapse, ensuring reliable synaptic transmission and plasticity. This synaptic anchoring function requires a compact NTD tier, stabilized by a GluA2-specific NTD interface. Here we show that low pH conditions, which accompany synaptic activity, rupture this interface. All-atom molecular dynamics simulations reveal that protonation of an interfacial histidine residue (H208) centrally contributes to NTD rearrangement. Moreover, in stark contrast to their canonical compact arrangement at neutral pH, GluA2 cryo-electron microscopy structures exhibit a wide spectrum of NTD conformations under acidic conditions. We show that the consequences of this pH-dependent conformational control are twofold: rupture of the NTD tier slows recovery from desensitized states and increases receptor mobility at mouse hippocampal synapses. Therefore, a proton-triggered NTD switch will shape both AMPAR location and kinetics, thereby impacting synaptic signal transmission.
Center for Structural Biology Vanderbilt University School of Medicine Nashville TN USA
Department of Physiology Development and Neuroscience University of Cambridge Cambridge UK
Institute of Physiology Czech Academy of Sciences Prague Czech Republic
Neurobiology Division Medical Research Council Laboratory of Molecular Biology Cambridge UK
Vanderbilt Brain Institute Vanderbilt University School of Medicine Nashville TN USA
References provided by Crossref.org
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