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Structures of the AMPA receptor in complex with its auxiliary subunit cornichon
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Structures of the AMPA receptor in complex with its auxiliary subunit cornichon
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Journal Article
Structures of the AMPA receptor in complex with its auxiliary subunit cornichon
2019
Overview
In the brain, AMPA-type glutamate receptors (AMPARs) form complexes with their auxiliary subunits and mediate the majority of fast excitatory neurotransmission. Signals transduced by these complexes are critical for synaptic plasticity, learning, and memory. The two major categories of AMPAR auxiliary subunits are transmembrane AMPAR regulatory proteins (TARPs) and cornichon homologs (CNIHs); these subunits share little homology and play distinct roles in controlling ion channel gating and trafficking of AMPAR. Here, I report high-resolution cryo–electron microscopy structures of AMPAR in complex with CNIH3. Contrary to its predicted membrane topology, CNIH3 lacks an extracellular domain and instead contains four membrane-spanning helices. The protein-protein interaction interface that dictates channel modulation and the lipids surrounding the complex are revealed. These structures provide insights into the molecular mechanism for ion channel modulation and assembly of AMPAR/CNIH3 complexes.
Publisher
American Association for the Advancement of Science,The American Association for the Advancement of Science
Subject
/ Assembly
/ Brain
/ Helices
/ Homology
/ Learning
/ Lipids
/ Memory
/ Protein Structure, Secondary
/ Proteins
/ Rats
/ Receptors, AMPA - physiology
/ Receptors, Glutamate - metabolism
/ Topology
/ α-Amino-3-hydroxy-5-methyl-4-isoxazole propionic acid
/ α-Amino-3-hydroxy-5-methyl-4-isoxazole propionic acid receptors
