X-ray diffraction
3.05Å resolution

X-ray crystal structure of a KirBac potassium channel highlights a mechanism of channel opening at the bundle-crossing gate.


Function and Biology Details

Structure analysis Details

Assembly composition:
homo tetramer (preferred)
Entry contents:
1 distinct polypeptide molecule
Inward rectifier potassium channel Kirbac3.1 Chain: A
Molecule details ›
Chain: A
Length: 301 amino acids
Theoretical weight: 33.85 KDa
Source organism: Magnetospirillum magnetotacticum
Expression system: Escherichia coli BL21(DE3)
  • Canonical: D9N164 (Residues: 1-295; Coverage: 100%)
Sequence domains:
Structure domains:

Ligands and Environments

2 bound ligands:
No modified residues

Experiments and Validation Details

Entry percentile scores
X-ray source: DIAMOND BEAMLINE I24
Spacegroup: P4212
Unit cell:
a: 106.24Å b: 106.24Å c: 89.8Å
α: 90° β: 90° γ: 90°
R R work R free
0.222 0.22 0.259
Expression system: Escherichia coli BL21(DE3)