8HKK

ion channel


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.84 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history


Literature

Structural basis of human Slo2.2 channel gating and modulation.

Zhang, J.Liu, S.Fan, J.Yan, R.Huang, B.Zhou, F.Yuan, T.Gong, J.Huang, Z.Jiang, D.

(2023) Cell Rep 42: 112858-112858

  • DOI: https://doi.org/10.1016/j.celrep.2023.112858
  • Primary Citation of Related Structures:  
    8HIR, 8HK6, 8HKF, 8HKK, 8HKM, 8HKQ

  • PubMed Abstract: 

    The sodium-activated Slo2.2 channel is abundantly expressed in the brain, playing a critical role in regulating neuronal excitability. The Na + -binding site and the underlying mechanisms of Na + -dependent activation remain unclear. Here, we present cryoelectron microscopy (cryo-EM) structures of human Slo2.2 in closed, open, and inhibitor-bound form at resolutions of 2.6-3.2 Å, revealing gating mechanisms of Slo2.2 regulation by cations and a potent inhibitor. The cytoplasmic gating ring domain of the closed Slo2.2 harbors multiple K + and Zn 2+ sites, which stabilize the channel in the closed conformation. The open Slo2.2 structure reveals at least two Na + -sensitive sites where Na + binding induces expansion and rotation of the gating ring that opens the inner gate. Furthermore, a potent inhibitor wedges into a pocket formed by pore helix and S6 helix and blocks the pore. Together, our results provide a comprehensive structural framework for the investigation of Slo2.2 channel gating, Na + sensation, and inhibition.


  • Organizational Affiliation

    Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; College of Life Science and Technology, Key Laboratory of Molecular Biophysics of MOE, Huazhong University of Science and Technology, Wuhan, Hubei, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Potassium channel subfamily T member 1
A, B, C, D
1,235Homo sapiensMutation(s): 0 
Gene Names: KCNT1
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q5JUK3 (Homo sapiens)
Explore Q5JUK3 
Go to UniProtKB:  Q5JUK3
PHAROS:  Q5JUK3
GTEx:  ENSG00000107147 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5JUK3
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
ZN (Subject of Investigation/LOI)
Query on ZN

Download Ideal Coordinates CCD File 
E [auth A],
M [auth B],
R [auth C],
W [auth D]
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
K (Subject of Investigation/LOI)
Query on K

Download Ideal Coordinates CCD File 
AA [auth D]
G [auth A]
H [auth A]
I [auth A]
J [auth A]
AA [auth D],
G [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
L [auth A],
N [auth B],
O [auth B],
P [auth B],
Q [auth B],
S [auth C],
T [auth C],
U [auth C],
V [auth C],
X [auth D],
Y [auth D],
Z [auth D]
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
NA (Subject of Investigation/LOI)
Query on NA

Download Ideal Coordinates CCD File 
F [auth A]SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.84 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China32271272

Revision History  (Full details and data files)

  • Version 1.0: 2023-08-16
    Type: Initial release