National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
1R35GM147266-01
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
3R35GM147266-01S1
米国
引用
ジャーナル: Nat Struct Mol Biol / 年: 2025 タイトル: Structural basis of GluK2 kainate receptor activation by a partial agonist. 著者: Guadalupe Segura-Covarrubias / Changping Zhou / Nebojša Bogdanović / Lisa Zhang / Nami Tajima / 要旨: Kainate receptors (KARs) belong to the family of ionotropic glutamate receptors that regulate neurotransmitter release and excitatory synaptic transmission in the central nervous system. Despite ...Kainate receptors (KARs) belong to the family of ionotropic glutamate receptors that regulate neurotransmitter release and excitatory synaptic transmission in the central nervous system. Despite their critical roles in synaptic signaling and disease, the detailed gating mechanisms of KARs are not completely understood. Here we present cryo-electron microscopy structures of homomeric rat GluK2 KAR in an unliganded apo state and in complexes with a partial agonist, domoate. Partial agonist-bound GluK2 populates multiple conformations, including intermediate and desensitized states. Moreover, we demonstrate that the N-glycans at the amino-terminal domain-ligand binding domain (LBD) interface modulate receptor gating properties by interfering with cation binding at the LBD dimer interface. Together, these results provide insights into the unique gating mechanisms of KARs.