National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
U24 GM129539
米国
Simons Foundation
SF349247
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
U24 GM129541
米国
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)
F31NS132554
米国
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)
NS139087
米国
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)
NS083660
米国
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)
NS107253
米国
National Institutes of Health/National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIH/NIAMS)
AR078814
米国
National Institutes of Health/National Cancer Institute (NIH/NCI)
CA206573
米国
引用
ジャーナル: Nat Commun / 年: 2026 タイトル: Auxiliary subunits reshape structural asymmetry and functional plasticity in heterotetrameric GluA1/A2 AMPA receptor core. 著者: Laura Y Yen / Thomas P Newton / Maria V Yelshanskaya / Muhammed Aktolun / Shanti Pal Gangwar / Rasmus P Clausen / Maria G Kurnikova / Alexander I Sobolevsky / 要旨: AMPA-subtype ionotropic glutamate receptors (AMPARs) mediate the fast component of excitatory neurotransmission. They govern synaptic plasticity that underlies learning and memory, while their ...AMPA-subtype ionotropic glutamate receptors (AMPARs) mediate the fast component of excitatory neurotransmission. They govern synaptic plasticity that underlies learning and memory, while their dysregulation is implicated in numerous neurological disorders. The functional diversity of AMPARs arises from variations in their subunit composition and also their association with auxiliary subunits. While multiple structures of homomeric AMPARs have been reported, structural information for the heteromeric core - particularly in the absence of auxiliary subunits, which would serve as a functional and structural baseline - has been limited. Here, we report cryo-electron microscopy structures of GluA1/A2, the most abundant AMPAR di-heteromer in the brain, in the closed, open, and desensitized states. Using molecular dynamics (MD) simulations and cross-correlating structural and functional information, we find that auxiliary subunits increase the diameter of channel pore, which corresponds to larger conductance. Likewise, we find that recovery from desensitization slows with greater disruption of two-fold rotational symmetry of the ligand-binding domain dimer in the desensitized state. Both receptor activation and desensitization vary with the type and number of associated auxiliary proteins. These structures offer a foundation for uncovering how auxiliary subunits reshape structural asymmetry and functional plasticity in heterotetrameric AMPARs.