X-ray diffraction
2Å resolution

Potassium Channel KcsA-Fab complex in high concentration of K+


Function and Biology Details

Structure analysis Details

Assembly composition:
hetero dodecamer (preferred)
Entry contents:
3 distinct polypeptide molecules
Macromolecules (3 distinct):
antibody Fab fragment heavy chain Chain: A
Molecule details ›
Chain: A
Length: 219 amino acids
Theoretical weight: 23.41 KDa
Source organism: Mus musculus
Structure domains: Immunoglobulins
antibody Fab fragment light chain Chain: B
Molecule details ›
Chain: B
Length: 212 amino acids
Theoretical weight: 23.44 KDa
Source organism: Mus musculus
Structure domains: Immunoglobulins
pH-gated potassium channel KcsA Chain: C
Molecule details ›
Chain: C
Length: 124 amino acids
Theoretical weight: 13.21 KDa
Source organism: Streptomyces lividans
Expression system: Escherichia coli
  • Canonical: P0A334 (Residues: 1-124; Coverage: 78%)
Gene names: kcsA, skc1
Sequence domains: Ion channel
Structure domains: Helix Hairpins

Ligands and Environments

3 bound ligands:
No modified residues

Experiments and Validation Details

Entry percentile scores
X-ray source: CHESS BEAMLINE A1
Spacegroup: I4
Unit cell:
a: 155.33Å b: 155.33Å c: 76.27Å
α: 90° β: 90° γ: 90°
R R work R free
0.218 0.218 0.233
Expression system: Escherichia coli