28NO | pdb_000028no

CTX/MthK complex

PDB DOI: https://doi.org/10.2210/pdb28NO/pdb
EM Map EMD-56657: EMDB EMDataResource

Classification: MEMBRANE PROTEIN
Organism(s): Leiurus hebraeus, Methanothermobacter thermautotrophicus str. Delta H
Expression System: Escherichia coli
Mutation(s): No

Deposited: 2026-02-10 Released: 2026-08-26
Deposition Author(s): Qoraj, D., Sprink, T., Lange, A.
Funding Organization(s): German Research Foundation (DFG), Leibniz Association

Experimental Data Snapshot

Method: ELECTRON MICROSCOPY
Resolution: 4.10 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

wwPDB Validation 3D Report Full Report

Validation slider image for 28NO

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

Literature

Atomic structure and plasticity of the CTX-MthK complex investigated by cryo-EM, NMR, and MD simulations

Qoraj, D., Mohr, S., Aldakul, Y.K., Sprink, T., Oster, C., Xiao, T., Schmieder, P., Lange, S., Utesch, T., Roderer, D., Chen, S., Sun, H., Lange, A.

(2026) Nat Commun 17: 8724

DOI: https://doi.org/10.1038/s41467-026-76925-2

Macromolecule Content

Total Structure Weight: 157.92 kDa
Atom Count: 3,084
Modeled Residue Count: 393
Deposited Residue Count: 1,413
Unique protein chains: 2

Macromolecules

Find similar proteins by:

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Potassium channel toxin alpha-KTx 1.1	A [auth E]	37	Leiurus hebraeus	Mutation(s): 0
UniProt
Find proteins for P13487 (Leiurus hebraeus) Explore P13487 Go to UniProtKB: P13487
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P13487
Sequence Annotations Expand
Reference Sequence

Find similar proteins by:

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Calcium-gated potassium channel MthK	B [auth A], C [auth B], D [auth C], E [auth D]	344	Methanothermobacter thermautotrophicus str. Delta H	Mutation(s): 0 Gene Names: mthK, MTH_1520
UniProt
Find proteins for O27564 (Methanothermobacter thermautotrophicus (strain ATCC 29096 / DSM 1053 / JCM 10044 / NBRC 100330 / Delta H)) Explore O27564 Go to UniProtKB: O27564
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	O27564
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
K Query on K Download:Ideal Coordinates CCD File SDF format, chain F [auth A] MOL2 format, chain F [auth A] mmCIF format, chain F [auth A]	F [auth A]	POTASSIUM ION K NPYPAHLBTDXSSS-UHFFFAOYSA-N		Interactions Focus chain F [auth A] Interactions & Density Focus chain F [auth A]

Modified Residues 1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
PCA Query on PCA	A [auth E]	L-PEPTIDE LINKING	C₅ H₇ N O₃		GLN

Experimental Data & Validation

Experimental Data

Method: ELECTRON MICROSCOPY
Resolution: 4.10 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX	1.21.2_5419
RECONSTRUCTION	RELION	5.0

Structure Validation

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Entry History

& Funding Information

Deposition Data

Released Date: 2026-08-26

Deposition Author(s):

Funding Organization	Location	Grant Number
German Research Foundation (DFG)	Germany	EXC 2008/1 UniSysCat 390540038
Leibniz Association	Germany	K305/2020

Revision History (Full details and data files)

Version 1.0: 2026-08-26
Type: Initial release

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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.