Potassium in PDB 1k4d: Potassium Channel Kcsa-Fab Complex in Low Concentration of K+

The structure of Potassium Channel Kcsa-Fab Complex in Low Concentration of K+, PDB code: 1k4d was solved by Y.Zhou, J.H.Morais-Cabral, A.Kaufman, R.Mackinnon, with X-Ray Crystallography technique. A brief refinement statistics is given in the table below:

Resolution Low / High (Å)	30.00 / 2.30
Space group	I 4
Cell size a, b, c (Å), α, β, γ (°)	155.290, 155.290, 75.740, 90.00, 90.00, 90.00
R / Rfree (%)	21.8 / 23.5

The structure of Potassium Channel Kcsa-Fab Complex in Low Concentration of K+ also contains other interesting chemical elements:

Sodium

(Na)

1 atom

The binding sites of Potassium atom in the Potassium Channel Kcsa-Fab Complex in Low Concentration of K+ (pdb code 1k4d). This binding sites where shown within 5.0 Angstroms radius around Potassium atom.
In total 2 binding sites of Potassium where determined in the Potassium Channel Kcsa-Fab Complex in Low Concentration of K+, PDB code: 1k4d:
Jump to Potassium binding site number: 1; 2;

Potassium binding site 1 out of 2 in the Potassium Channel Kcsa-Fab Complex in Low Concentration of K+


Mono view


Stereo pair view

A full contact list of Potassium with other atoms in the K binding site number 1 of Potassium Channel Kcsa-Fab Complex in Low Concentration of K+ within 5.0Å range: probe atom residue distance (Å) B Occ C:K2001 b:75.5 occ:0.25 O C:GLY77 2.8 28.2 1.0 C C:GLY77 3.7 28.4 1.0 O C:TYR78 4.0 29.1 1.0 C C:TYR78 4.0 29.1 1.0 N C:GLY79 4.1 29.4 1.0 CA C:GLY79 4.2 29.6 1.0 O C:HOH2005 4.4 47.2 0.2 CA C:GLY77 4.5 27.8 1.0 N C:TYR78 4.6 28.2 1.0 CA C:TYR78 4.7 28.8 1.0

Potassium binding site 2 out of 2 in the Potassium Channel Kcsa-Fab Complex in Low Concentration of K+


Mono view


Stereo pair view

A full contact list of Potassium with other atoms in the K binding site number 2 of Potassium Channel Kcsa-Fab Complex in Low Concentration of K+ within 5.0Å range: probe atom residue distance (Å) B Occ C:K2002 b:37.4 occ:0.25 O C:THR75 2.9 29.3 1.0 OG1 C:THR75 3.0 30.1 1.0 O C:HOH2043 3.3 92.6 0.2 O C:HOH2004 3.3 35.9 0.2 CB C:THR75 3.6 29.4 1.0 C C:THR75 4.0 29.1 1.0 CA C:THR75 4.5 29.1 1.0 CG2 C:THR75 4.8 30.9 1.0

Y.Zhou, J.H.Morais-Cabral, A.Kaufman, R.Mackinnon. Chemistry of Ion Coordination and Hydration Revealed By A K+ Channel-Fab Complex at 2.0 A Resolution. Nature V. 414 43 2001.
ISSN: ISSN 0028-0836
PubMed: 11689936
DOI: 10.1038/35102009