Caesium in PDB 1r3l: Potassium Channel Kcsa-Fab Complex in Cs+

The structure of Potassium Channel Kcsa-Fab Complex in Cs+, PDB code: 1r3l was solved by Y.Zhou, R.Mackinnon, with X-Ray Crystallography technique. A brief refinement statistics is given in the table below:

Resolution Low / High (Å)	26.57 / 2.41
Space group	I 4
Cell size a, b, c (Å), α, β, γ (°)	154.910, 154.910, 75.490, 90.00, 90.00, 90.00
R / Rfree (%)	21.9 / 24.9

The binding sites of Caesium atom in the Potassium Channel Kcsa-Fab Complex in Cs+ (pdb code 1r3l). This binding sites where shown within 5.0 Angstroms radius around Caesium atom.
In total 5 binding sites of Caesium where determined in the Potassium Channel Kcsa-Fab Complex in Cs+, PDB code: 1r3l:
Jump to Caesium binding site number: 1; 2; 3; 4; 5;

Caesium binding site 1 out of 5 in the Potassium Channel Kcsa-Fab Complex in Cs+


Mono view


Stereo pair view

A full contact list of Caesium with other atoms in the Cs binding site number 1 of Potassium Channel Kcsa-Fab Complex in Cs+ within 5.0Å range: probe atom residue distance (Å) B Occ C:Cs201 b:33.5 occ:0.25 O C:GLY77 3.1 40.6 1.0 O C:TYR78 3.2 28.8 1.0 C C:TYR78 3.6 33.5 1.0 N C:GLY79 4.2 33.9 1.0 C C:GLY77 4.2 40.3 1.0 CA C:TYR78 4.2 34.8 1.0 CA C:GLY79 4.5 31.4 1.0 O C:HOH313 4.5 54.0 0.2 N C:TYR78 4.7 38.4 1.0 CS C:CS202 4.8 36.7 0.2

Caesium binding site 2 out of 5 in the Potassium Channel Kcsa-Fab Complex in Cs+


Mono view


Stereo pair view

A full contact list of Caesium with other atoms in the Cs binding site number 2 of Potassium Channel Kcsa-Fab Complex in Cs+ within 5.0Å range: probe atom residue distance (Å) B Occ C:Cs202 b:36.7 occ:0.25 O C:VAL76 3.1 32.5 1.0 O C:THR75 3.4 38.3 1.0 C C:VAL76 3.7 35.3 1.0 CS C:CS203 4.3 52.0 0.2 O C:GLY77 4.3 40.6 1.0 N C:GLY77 4.4 38.5 1.0 CA C:VAL76 4.5 34.8 1.0 CA C:GLY77 4.5 39.5 1.0 C C:GLY77 4.6 40.3 1.0 C C:THR75 4.6 36.0 1.0 CS C:CS201 4.8 33.5 0.2

Caesium binding site 3 out of 5 in the Potassium Channel Kcsa-Fab Complex in Cs+


Mono view


Stereo pair view

A full contact list of Caesium with other atoms in the Cs binding site number 3 of Potassium Channel Kcsa-Fab Complex in Cs+ within 5.0Å range: probe atom residue distance (Å) B Occ C:Cs203 b:52.0 occ:0.25 OG1 C:THR75 3.0 36.4 1.0 O C:THR75 3.1 38.3 1.0 CB C:THR75 3.5 32.9 1.0 CS C:CS204 3.8 0.7 0.3 C C:THR75 3.9 36.0 1.0 CS C:CS202 4.3 36.7 0.2 CA C:THR75 4.3 34.2 1.0 CG2 C:THR75 4.7 34.6 1.0 N C:VAL76 4.8 35.8 1.0

Caesium binding site 4 out of 5 in the Potassium Channel Kcsa-Fab Complex in Cs+


Mono view


Stereo pair view

A full contact list of Caesium with other atoms in the Cs binding site number 4 of Potassium Channel Kcsa-Fab Complex in Cs+ within 5.0Å range: probe atom residue distance (Å) B Occ C:Cs204 b:0.7 occ:0.25 CS C:CS205 3.5 60.8 0.2 O C:HOH324 3.6 61.0 1.0 OG1 C:THR75 3.6 36.4 1.0 CS C:CS203 3.8 52.0 0.2 CB C:THR75 4.6 32.9 1.0 CG2 C:THR75 4.8 34.6 1.0

Caesium binding site 5 out of 5 in the Potassium Channel Kcsa-Fab Complex in Cs+


Mono view


Stereo pair view

A full contact list of Caesium with other atoms in the Cs binding site number 5 of Potassium Channel Kcsa-Fab Complex in Cs+ within 5.0Å range: probe atom residue distance (Å) B Occ C:Cs205 b:60.8 occ:0.25 CS C:CS204 3.5 0.7 0.3 O C:HOH324 3.7 61.0 1.0 O C:HOH312 4.3 60.3 1.0

Y.Zhou, R.Mackinnon. The Occupancy of Ions in the K+ Selectivity Filter: Charge Balance and Coupling of Ion Binding to A Protein Conformational Change Underlie High Conduction Rates J.Mol.Biol. V. 333 965 2003.
ISSN: ISSN 0022-2836
PubMed: 14583193
DOI: 10.1016/J.JMB.2003.09.022