Cited by 1,087Neuroscience and Neuropharmacology ResearchIon channel regulation and functionNicotinic Acetylcholine Receptors Study

Divalent ion permeability of AMPA receptor channels is dominated by the edited form of a single subunit

Burnashev, N., Monyer, H., Seeburg, P.H., Sakmann, B.·1992·Neuron

Abstract

Functionally diverse GluR channels of the AMPA subtype are generated by the assembly of GluR-A, -B, -C, and -D subunits into homo- and heteromeric channels. The GluR-B subunit is dominant in determining functional properties of heteromeric AMPA receptors. This subunit exists in developmentally distinct edited and unedited forms, GluR-B(R) and GluR-B(Q), which differ in a single amino acid in transmembrane segment TM2 (Q/R site). Homomeric GluR-B(R) channels expressed in 293 cells display a low divalent permeability, whereas homomeric GluR-B(Q) and GluR-D channels exhibit a high divalent permeability. Mutational analysis revealed that both the positive charge and the size of the amino acid side chain located at the Q/R site control the divalent permeability of homomeric channels. Coexpression of Q/R site arginine- and glutamine-containing subunits generates cells with varying divalent permeabilities depending on the amounts of expression vectors used for cell transfection. Intermediate divalent permeabilities were traced to the presence of both divalent permeant homomeric and impermeant heteromeric channels. It is suggested that the positive charge contributed by the arginine of the edited GluR-B(R) subunit determines low divalent permeability in heteromeric GluR channels and that changes in GluR-B(R) expression regulate the AMPA receptor-dependent divalent permeability of a cell.

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Crossref · 10.1016/0896-6273(92)90120-3

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  • GluA2-containing receptors have a linear current-voltage relationship and are impermeable to Ca2+, while GluA2-lacking receptors show high conductance, rapid decay kinetics, inward-rectification due to voltage-dependent block by intracellular polyamines, and are permeable to Ca2+.

    “The result of this modification is that GluA2 containing receptors have a linear current-voltage (I-V) relationship and are impermeable to Ca2+, while GluA2-lacking receptors show high conductance and rapid decay kinetics, inward-rectification due to voltage-dependent block by intracellular polyamines and are permeable to Ca2+, thus GluA2-lacking receptors are usually referred to as calcium-perme”

    From The AMPA Receptor Code of Synaptic Plasticity (2018) · cites this paper as Burnashev et al., 1992

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Authors
Burnashev, N., Monyer, H., Seeburg, P. H., & Sakmann, B.
Affiliations
  • Max Planck Institute for Medical Research (DE)
  • Max Planck Society (DE)
Venue
Neuron
Publisher
Elsevier BV
Published
1992-01
Volume
8
Issue
1
Pages
189-198
ISSN
0896-6273 (ISSN-L)
OpenAlex
W2051084778
Cited by
1,087
References
1
Citations by year
2026: 9 · 2025: 17 · 2024: 19 · 2023: 20 · 2022: 13 · 2021: 19 · 2020: 24 · 2019: 19 · 2018: 17 · 2017: 24 · 2016: 16 · 2015: 20 · 2014: 29 · 2013: 25 · 2012: 35
FWCI
28.94
Type
journal article
Language
en
Open access
closed
Locations
  • Neuron (publishedVersion)
  • PubMed (publishedVersion)
  • Max Planck Institute for Plasma Physics (submittedVersion)
  • Max Planck Digital Library (submittedVersion)
  • MPG.PuRe (Max Planck Society) (submittedVersion)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nicotinic Acetylcholine Receptors Study
Keywords
AMPA receptors, RNA editing, heteromeric channels, homomeric channels, ion channel permeation
MeSH terms
Base Sequence, Calcium, Cations, Divalent, Cell Line, Electrophysiology, Glutamates, Humans, Ion Channels, Magnesium, Membrane Potentials, Molecular Sequence Data, Permeability, Recombinant Proteins, RNA, Messenger, Sodium, Transfection, Gene Expression, Receptors, Neurotransmitter, Receptors, AMPA, Glutamic Acid, Macromolecular Substances

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