X-ray diffraction
3.31Å resolution

Crystal structure of the human two pore domain K+ ion channel TRAAK (K2P4.1)


Function and Biology Details

Structure analysis Details

Assembly composition:
homo dimer (preferred)
Entry contents:
1 distinct polypeptide molecule
Potassium channel subfamily K member 4 Chains: A, B
Molecule details ›
Chains: A, B
Length: 309 amino acids
Theoretical weight: 33.59 KDa
Source organism: Homo sapiens
Expression system: Komagataella pastoris
  • Canonical: Q9NYG8 (Residues: 1-274; Coverage: 70%)
  • Best match: Q9NYG8-2 (Residues: 1-300)
Gene names: KCNK4, TRAAK
Sequence domains: Ion channel
Structure domains:

Ligands and Environments

1 bound ligand:
No modified residues

Experiments and Validation Details

Entry percentile scores
X-ray source: APS BEAMLINE 23-ID-D
Spacegroup: P212121
Unit cell:
a: 87.938Å b: 130.852Å c: 132.779Å
α: 90° β: 90° γ: 90°
R R work R free
0.317 0.317 0.323
Expression system: Komagataella pastoris