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Two gates mediate NMDA receptor activity and are under subunit-specific regulation

Author

Listed:
  • Johansen B. Amin

    (Stony Brook University
    Stony Brook University)

  • Miaomiao He

    (Stony Brook University)

  • Ramesh Prasad

    (University of Illinois at Chicago)

  • Xiaoling Leng

    (University of Illinois at Chicago)

  • Huan-Xiang Zhou

    (University of Illinois at Chicago
    University of Illinois at Chicago)

  • Lonnie P. Wollmuth

    (Stony Brook University
    Stony Brook University
    Stony Brook University)

Abstract

Kinetics of NMDA receptor (NMDAR) ion channel opening and closing contribute to their unique role in synaptic signaling. Agonist binding generates free energy to open a canonical gate at the M3 helix bundle crossing. Single channel activity is characterized by clusters, or periods of rapid opening and closing, that are separated by long silent periods. A conserved glycine in the outer most transmembrane helices, the M4 helices, regulates NMDAR function. Here we find that the GluN1 glycine mainly regulates single channel events within a cluster, whereas the GluN2 glycine mainly regulates entry and exit from clusters. Molecular dynamics simulations suggest that, whereas the GluN2 M4 (along with GluN2 pre-M1) regulates the gate at the M3 helix bundle crossing, the GluN1 glycine regulates a ‘gate’ at the M2 loop. Subsequent functional experiments support this interpretation. Thus, the distinct kinetics of NMDARs are mediated by two gates that are under subunit-specific regulation.

Suggested Citation

  • Johansen B. Amin & Miaomiao He & Ramesh Prasad & Xiaoling Leng & Huan-Xiang Zhou & Lonnie P. Wollmuth, 2023. "Two gates mediate NMDA receptor activity and are under subunit-specific regulation," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-37260-y
    DOI: 10.1038/s41467-023-37260-y
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    References listed on IDEAS

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