Sodium in PDB 6w9p: TEL26 Parallel Four-Quartet G-Quadruplex with K+

The structure of TEL26 Parallel Four-Quartet G-Quadruplex with K+, PDB code: 6w9p was solved by S.E.Mccarthy, L.A.Yatsunyk, D.Beseiso, J.Miao, with X-Ray Crystallography technique. A brief refinement statistics is given in the table below:

Resolution Low / High (Å)	33.50 / 1.99
Space group	P 31 2 1
Cell size a, b, c (Å), α, β, γ (°)	38.681, 38.681, 64.921, 90, 90, 120
R / Rfree (%)	19.7 / 20.9

The structure of TEL26 Parallel Four-Quartet G-Quadruplex with K+ also contains other interesting chemical elements:

Potassium

(K)

3 atoms

The binding sites of Sodium atom in the TEL26 Parallel Four-Quartet G-Quadruplex with K+ (pdb code 6w9p). This binding sites where shown within 5.0 Angstroms radius around Sodium atom.
In total only one binding site of Sodium was determined in the TEL26 Parallel Four-Quartet G-Quadruplex with K+, PDB code: 6w9p:

Sodium binding site 1 out of 1 in the TEL26 Parallel Four-Quartet G-Quadruplex with K+


Mono view


Stereo pair view

A full contact list of Sodium with other atoms in the Na binding site number 1 of TEL26 Parallel Four-Quartet G-Quadruplex with K+ within 5.0Å range: probe atom residue distance (Å) B Occ A:Na104 b:33.2 occ:0.66 O A:HOH213 2.4 28.4 0.6 O A:HOH221 2.4 37.2 0.9 O A:HOH229 2.5 35.2 0.8 OP1 A:DG17 2.6 40.1 1.0 O A:HOH224 2.7 49.7 1.0 P A:DG17 3.5 41.1 1.0 O3' A:DG16 3.6 39.9 1.0 O5' A:DG17 3.8 42.6 1.0 O4' A:DG17 4.0 43.2 1.0 C4' A:DG17 4.3 46.9 1.0 C5' A:DG17 4.6 47.6 1.0 C3' A:DG16 4.8 36.7 1.0 C2' A:DG16 4.9 36.6 1.0 OP2 A:DG17 4.9 39.7 1.0 C1' A:DG16 5.0 38.4 1.0

S.E.Mccarthy, L.A.Yatsunyk, D.Beseiso, J.Miao. Structural Diversity and Ligand Binding of G-Rich Dna From Telomeric Region of Tetrahymena Thermophila To Be Published.