7YFO

Structure of GluN1a E698C-GluN2D NMDA receptor in cystines crosslinked state.

Summary for 7YFO

• Entry DOI: 10.2210/pdb7yfo/pdb
• EMDB information: 33788 33795
• Descriptor: Glutamate receptor ionotropic, NMDA 1, Glutamate receptor ionotropic, NMDA 2D (2 entities in total)
• Functional Keywords: ion channel, cryo-em structure, glutamate receptor, synaptic protein, electron transport
• Biological source: Homo sapiens (human); More
• Total number of polymer chains: 4
• Total formula weight: 384873.03

Authors

Zhang, J.L.,Zhu, S.J.,Zhang, M. (deposition date: 2022-07-08, release date: 2023-04-12, Last modification date: 2023-08-02)

Primary citation

Zhang, J.,Zhang, M.,Wang, Q.,Wen, H.,Liu, Z.,Wang, F.,Wang, Y.,Yao, F.,Song, N.,Kou, Z.,Li, Y.,Guo, F.,Zhu, S.
Distinct structure and gating mechanism in diverse NMDA receptors with GluN2C and GluN2D subunits.
Nat.Struct.Mol.Biol., 30:629-639, 2023

PubMed Abstract: N-methyl-D-aspartate (NMDA) receptors are heterotetramers comprising two GluN1 and two alternate GluN2 (N2A-N2D) subunits. Here we report full-length cryo-EM structures of the human N1-N2D di-heterotetramer (di-receptor), rat N1-N2C di-receptor and N1-N2A-N2C tri-heterotetramer (tri-receptor) at a best resolution of 3.0 Å. The bilobate N-terminal domain (NTD) in N2D intrinsically adopts a closed conformation, leading to a compact NTD tetramer in the N1-N2D receptor. Additionally, crosslinking the ligand-binding domain (LBD) of two N1 protomers significantly elevated the channel open probability (Po) in N1-N2D di-receptors. Surprisingly, the N1-N2C di-receptor adopted both symmetric (minor) and asymmetric (major) conformations, the latter further locked by an allosteric potentiator, PYD-106, binding to a pocket between the NTD and LBD in only one N2C protomer. Finally, the N2A and N2C subunits in the N1-N2A-N2C tri-receptor display a conformation close to one protomer in the N1-N2A and N1-N2C di-receptors, respectively. These findings provide a comprehensive structural understanding of diverse function in major NMDA receptor subtypes.

PubMed: 36959261
DOI: 10.1038/s41594-023-00959-z

Experimental method

ELECTRON MICROSCOPY (6.4 Å)