9X5J | pdb_00009x5j

Cryo-EM structure of the human KCNQ2/3 heteromer channel

PDB DOI: https://doi.org/10.2210/pdb9X5J/pdb
EM Map EMD-66589: EMDB EMDataResource

Classification: MEMBRANE PROTEIN
Organism(s): Homo sapiens
Expression System: Human adenovirus sp., Homo sapiens
Mutation(s): No

Deposited: 2025-10-13 Released: 2026-06-03
Deposition Author(s): Cheng, X.Y., Wan, S.Y., Hou, P.P., Zhang, J.
Funding Organization(s): Not funded

Experimental Data Snapshot

Method: ELECTRON MICROSCOPY
Resolution: 3.05 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

wwPDB Validation 3D Report Full Report

Validation slider image for 9X5J

This is version 1.0 of the entry. See complete history.

Literature

Cryo-EM structure of the human KCNQ2/3 heteromer channel

Cheng, X.Y., Wan, S.Y., Hou, P.P., Zhang, J.

To be published.

Macromolecule Content

Total Structure Weight: 285.91 kDa
Atom Count: 15,300
Modeled Residue Count: 1,900
Deposited Residue Count: 2,510
Unique protein chains: 3

Macromolecules

Find similar proteins by:

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Calmodulin-1	A [auth F], B [auth E], C [auth H], D [auth G]	143	Homo sapiens	Mutation(s): 0 Gene Names: CALM1, CALM, CAM, CAM1
UniProt & NIH Common Fund Data Resources
Find proteins for P0DP23 (Homo sapiens) Explore P0DP23 Go to UniProtKB: P0DP23
PHAROS: P0DP23 GTEx: ENSG00000198668
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P0DP23
Sequence Annotations Expand
Reference Sequence

Find similar proteins by:

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Potassium voltage-gated channel subfamily KQT member 3	E [auth B], F [auth C], H [auth A]	471	Homo sapiens	Mutation(s): 0 Gene Names: KCNQ3
UniProt & NIH Common Fund Data Resources
Find proteins for O43525 (Homo sapiens) Explore O43525 Go to UniProtKB: O43525
PHAROS: O43525 GTEx: ENSG00000184156
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	O43525
Sequence Annotations Expand
Reference Sequence

Find similar proteins by:

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Potassium voltage-gated channel subfamily KQT member 2	G [auth D]	525	Homo sapiens	Mutation(s): 0 Gene Names: KCNQ2
UniProt & NIH Common Fund Data Resources
Find proteins for O43526 (Homo sapiens) Explore O43526 Go to UniProtKB: O43526
PHAROS: O43526 GTEx: ENSG00000075043
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	O43526
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
K (Subject of Investigation/LOI) Query on K Download:Ideal Coordinates CCD File SDF format, chain I [auth B] SDF format, chain J [auth A] SDF format, chain K [auth A] SDF format, chain L [auth A] MOL2 format, chain I [auth B] MOL2 format, chain J [auth A] MOL2 format, chain K [auth A] MOL2 format, chain L [auth A] mmCIF format, chain I [auth B] mmCIF format, chain J [auth A] mmCIF format, chain K [auth A] mmCIF format, chain L [auth A]	I [auth B], J [auth A], K [auth A], L [auth A]	POTASSIUM ION K NPYPAHLBTDXSSS-UHFFFAOYSA-N		Interactions Focus chain I [auth B] Focus chain J [auth A] Focus chain K [auth A] Focus chain L [auth A] Interactions & Density Focus chain I [auth B] Focus chain J [auth A] Focus chain K [auth A] Focus chain L [auth A]

Experimental Data & Validation

Experimental Data

Method: ELECTRON MICROSCOPY
Resolution: 3.05 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX	1.16_3549
RECONSTRUCTION	cryoSPARC

Structure Validation

View Full Validation Report

View more in-depth experimental data

Entry History

& Funding Information

Deposition Data

Released Date: 2026-06-03

Deposition Author(s):

Funding Organization	Location	Grant Number
Not funded		--

Revision History (Full details and data files)

Version 1.0: 2026-06-03
Type: Initial release

RCSB PDB is hosted by

RCSB PDB is a member of

RCSB Partners
Nucleic Acid Knowledgebase

CoreTrustSeal

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.