Kainate receptor modulation by NETO2

Lingli He, Jiahui Sun, Yiwei Gao, Bin Li, Yuhang Wang, Yanli Dong, Weidong An, Hang Li, Bei Yang, Yuhan Ge, Xuejun Cai Zhang (), Yun Stone Shi () and Yan Zhao ()
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Lingli He: Chinese Academy of Sciences
Jiahui Sun: Nanjing University
Yiwei Gao: Chinese Academy of Sciences
Bin Li: Chinese Academy of Sciences
Yuhang Wang: Chinese Academy of Sciences
Yanli Dong: Chinese Academy of Sciences
Weidong An: Chinese Academy of Sciences
Hang Li: Chinese Academy of Sciences
Bei Yang: Chinese Academy of Sciences
Yuhan Ge: Nanjing University
Xuejun Cai Zhang: Chinese Academy of Sciences
Yun Stone Shi: Nanjing University
Yan Zhao: Chinese Academy of Sciences

Nature, 2021, vol. 599, issue 7884, 325-329

Abstract: Abstract Glutamate-gated kainate receptors are ubiquitous in the central nervous system of vertebrates, mediate synaptic transmission at the postsynapse and modulate transmitter release at the presynapse1–7. In the brain, the trafficking, gating kinetics and pharmacology of kainate receptors are tightly regulated by neuropilin and tolloid-like (NETO) proteins8–11. Here we report cryo-electron microscopy structures of homotetrameric GluK2 in complex with NETO2 at inhibited and desensitized states, illustrating variable stoichiometry of GluK2–NETO2 complexes, with one or two NETO2 subunits associating with GluK2. We find that NETO2 accesses only two broad faces of kainate receptors, intermolecularly crosslinking the lower lobe of ATDA/C, the upper lobe of LBDB/D and the lower lobe of LBDA/C, illustrating how NETO2 regulates receptor-gating kinetics. The transmembrane helix of NETO2 is positioned proximal to the selectivity filter and competes with the amphiphilic H1 helix after M4 for interaction with an intracellular cap domain formed by the M1–M2 linkers of the receptor, revealing how rectification is regulated by NETO2.

Date: 2021
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DOI: 10.1038/s41586-021-03936-y

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