Potassium in PDB 8k0u: Crystal Structure of Theophylline Dna Aptamer Bound to Hypoxanthine

The structure of Crystal Structure of Theophylline Dna Aptamer Bound to Hypoxanthine, PDB code: 8k0u was solved by Y.Huang, X.Lin, L.Huang, with X-Ray Crystallography technique. A brief refinement statistics is given in the table below:

Resolution Low / High (Å)	42.52 / 1.52
Space group	P 32 2 1
Cell size a, b, c (Å), α, β, γ (°)	49.102, 49.102, 51.657, 90, 90, 120
R / Rfree (%)	22.2 / 24.7

The structure of Crystal Structure of Theophylline Dna Aptamer Bound to Hypoxanthine also contains other interesting chemical elements:

Sodium

(Na)

4 atoms

The binding sites of Potassium atom in the Crystal Structure of Theophylline Dna Aptamer Bound to Hypoxanthine (pdb code 8k0u). This binding sites where shown within 5.0 Angstroms radius around Potassium atom.
In total only one binding site of Potassium was determined in the Crystal Structure of Theophylline Dna Aptamer Bound to Hypoxanthine, PDB code: 8k0u:

Potassium binding site 1 out of 1 in the Crystal Structure of Theophylline Dna Aptamer Bound to Hypoxanthine


Mono view


Stereo pair view

A full contact list of Potassium with other atoms in the K binding site number 1 of Crystal Structure of Theophylline Dna Aptamer Bound to Hypoxanthine within 5.0Å range: probe atom residue distance (Å) B Occ A:K106 b:66.2 occ:0.50 OP2 A:DC26 2.6 50.3 1.0 O A:HOH248 3.1 38.3 1.0 P A:DC26 3.8 40.7 1.0 O5' A:DC26 3.9 39.4 1.0 H2'' A:DG25 4.2 37.8 1.0 H3' A:DG25 4.3 38.1 1.0 H3' A:DC26 4.6 46.6 1.0 OP1 A:DC26 4.6 45.6 1.0 H2' A:DG25 4.8 37.8 1.0 C2' A:DG25 4.8 31.4 1.0 C3' A:DG25 4.8 31.6 1.0 O3' A:DG25 4.8 35.8 1.0 H6 A:DC26 5.0 31.4 1.0

X.Lin, Y.Huang, J.Huang, H.Yuan, Y.Luo, Z.Lu, Y.Ao, J.Huang, S.B.Chen, Z.Miao, L.Huang. From Theophylline to Adenine or Preq 1 : Repurposing A Dna Aptamer Revealed By Crystal Structure Analysis. Angew.Chem.Int.Ed.Engl. 04107 2025.
ISSN: ESSN 1521-3773
PubMed: 40101171
DOI: 10.1002/ANIE.202504107