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Updated: Oct 19, 2025

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Kainate receptor modulation by NETO2.

Lingli He1,2,3, Jiahui Sun4,5, Yiwei Gao1,3

  • 1National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China.

Nature
|September 23, 2021
PubMed
Summary
This summary is machine-generated.

Neuropilin and tolloid-like (NETO) proteins regulate brain kainate receptors. This study reveals cryo-EM structures of GluK2-NETO2 complexes, showing how NETO2 controls receptor gating and rectification.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Structural Biology

Background:

  • Kainate receptors are crucial for synaptic transmission and neurotransmitter release in the vertebrate central nervous system.
  • Neuropilin and tolloid-like (NETO) proteins are key regulators of kainate receptor trafficking, gating, and pharmacology in the brain.

Purpose of the Study:

  • To elucidate the structural basis of NETO2 regulation of kainate receptors.
  • To determine the stoichiometry and interaction interfaces of GluK2-NETO2 complexes.
  • To understand how NETO2 influences receptor gating kinetics and rectification.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) to determine high-resolution structures.
  • Structural analysis of homotetrameric GluK2 in complex with NETO2 at inhibited and desensitized states.

Main Results:

  • Variable stoichiometry observed, with one or two NETO2 subunits associating with GluK2.
  • NETO2 interacts with specific regions of the kainate receptor, including ATD and LBD lobes, influencing gating.
  • NETO2's transmembrane helix competes with the H1 helix for intracellular interactions, revealing mechanisms of rectification.

Conclusions:

  • NETO2 plays a critical role in modulating kainate receptor function through direct structural interactions.
  • The findings provide atomic-level insights into the regulation of synaptic receptor activity by auxiliary proteins.
  • This work advances our understanding of ion channel regulation and its implications for brain function.