3UKM

Crystal structure of the human two pore domain potassium ion channel K2P1 (TWIK-1)

PDB DOI: https://doi.org/10.2210/pdb3UKM/pdb

Classification: MEMBRANE PROTEIN
Organism(s): Homo sapiens
Expression System: Komagataella pastoris
Mutation(s): Yes
Membrane Protein: Yes OPMPDBTMMemProtMDmpstruc

Deposited: 2011-11-09 Released: 2012-02-08
Deposition Author(s): Long, S.B., Miller, A.N.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 3.40 Å
R-Value Free: 0.279
R-Value Work: 0.273
R-Value Observed: 0.273

wwPDB Validation 3D Report Full Report

Ligand Structure Quality Assessment

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

Literature

Crystal structure of the human two-pore domain potassium channel K2P1.

Miller, A.N., Long, S.B.

(2012) Science 335: 432-436

PubMed: 22282804 Search on PubMed
DOI: https://doi.org/10.1126/science.1213274
Primary Citation of Related Structures:
3UKM

PubMed Abstract:
Two-pore domain potassium (K(+)) channels (K2P channels) control the negative resting potential of eukaryotic cells and regulate cell excitability by conducting K(+) ions across the plasma membrane. Here, we present the 3.4 angstrom resolution crystal structure of a human K2P channel, K2P1 (TWIK-1). Unlike other K(+) channel structures, K2P1 is dimeric. An extracellular cap domain located above the selectivity filter forms an ion pathway in which K(+) ions flow through side portals. Openings within the transmembrane region expose the pore to the lipid bilayer and are filled with electron density attributable to alkyl chains. An interfacial helix appears structurally poised to affect gating. The structure lays a foundation to further investigate how K2P channels are regulated by diverse stimuli.

Organizational Affiliation

Structural Biology Program, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, NY 10065, USA.

Macromolecule Content

Total Structure Weight: 128.66 kDa
Atom Count: 7,606
Modelled Residue Count: 1,008
Deposited Residue Count: 1,120
Unique protein chains: 1

Macromolecules

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(by identity cutoff) | 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Potassium channel subfamily K member 1	A, B, C, D	280	Homo sapiens	Mutation(s): 3 Gene Names: HOHO1, K2P1 (TWIK-1), KCNK1, KCNO1, TWIK1 Membrane Entity: Yes
UniProt & NIH Common Fund Data Resources
Find proteins for O00180 (Homo sapiens) Explore O00180 Go to UniProtKB: O00180
PHAROS: O00180 GTEx: ENSG00000135750
Entity Groups
Sequence Clusters	30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt Group	O00180
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
UND Query on UND Download Ideal Coordinates CCD File SDF format, chain E [auth A] SDF format, chain K [auth B] SDF format, chain L [auth C] SDF format, chain R [auth D] MOL2 format, chain E [auth A] MOL2 format, chain K [auth B] MOL2 format, chain L [auth C] MOL2 format, chain R [auth D]	E [auth A], K [auth B], L [auth C], R [auth D]	UNDECANE C₁₁ H₂₄ RSJKGSCJYJTIGS-UHFFFAOYSA-N		Interactions Focus chain E [auth A] Focus chain K [auth B] Focus chain L [auth C] Focus chain R [auth D] Interactions & Density Focus chain E [auth A] Focus chain K [auth B] Focus chain L [auth C] Focus chain R [auth D]
K Query on K Download Ideal Coordinates CCD File SDF format, chain F [auth A] SDF format, chain G [auth A] SDF format, chain H [auth A] SDF format, chain I [auth A] SDF format, chain J [auth A] SDF format, chain M [auth C] SDF format, chain N [auth C] SDF format, chain O [auth C] SDF format, chain P [auth C] SDF format, chain Q [auth C] MOL2 format, chain F [auth A] MOL2 format, chain G [auth A] MOL2 format, chain H [auth A] MOL2 format, chain I [auth A] MOL2 format, chain J [auth A] MOL2 format, chain M [auth C] MOL2 format, chain N [auth C] MOL2 format, chain O [auth C] MOL2 format, chain P [auth C] MOL2 format, chain Q [auth C]	F [auth A] G [auth A] H [auth A] I [auth A] J [auth A] F [auth A], G [auth A], H [auth A], I [auth A], J [auth A], M [auth C], N [auth C], O [auth C], P [auth C], Q [auth C]	POTASSIUM ION K NPYPAHLBTDXSSS-UHFFFAOYSA-N		Interactions Focus chain F [auth A] Focus chain G [auth A] Focus chain H [auth A] Focus chain I [auth A] Focus chain J [auth A] Focus chain M [auth C] Focus chain N [auth C] Focus chain O [auth C] Focus chain P [auth C] Focus chain Q [auth C] Interactions & Density Focus chain F [auth A] Focus chain G [auth A] Focus chain H [auth A] Focus chain I [auth A] Focus chain J [auth A] Focus chain M [auth C] Focus chain N [auth C] Focus chain O [auth C] Focus chain P [auth C] Focus chain Q [auth C]