ISDA

Deposition Date 1995-10-19

Release Date 1996-02-23

Last Version Date 2024-02-14

Entry Detail

PDB ID:

244D

Keywords:

DNA

Title:

THE HIGH-RESOLUTION CRYSTAL STRUCTURE OF A PARALLEL-STRANDED GUANINE TETRAPLEX

Biological Source:

Source Organism:

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.20 Å

R-Value Free:

0.17

R-Value Observed:

0.12

Space Group:

P 1

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Macromolecular Entities

Polymer Type:polydeoxyribonucleotide
Molecule:DNA (5'-D(*TP*GP*GP*GP*GP*T)-3')
Chain IDs:A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P
Chain Length:6
Number of Molecules:16
Biological Source:

Ligand Molecules

Primary Citation

The high-resolution crystal structure of a parallel-stranded guanine tetraplex.

Laughlan, G, Murchie, A.I, Norman, D.G, Moore, M.H, Moody, P.C, Lilley, D.M, Luisi, B.Show

Science 265 520 524 (1994)

PMID: 8036494

Abstact

Repeat tracts of guanine bases found in DNA and RNA can form tetraplex structures in the presence of a variety of monovalent cations. Evidence suggests that guanine tetraplexes assume important functions within chromosomal telomeres, immunoglobulin switch regions, and the human immunodeficiency virus genome. The structure of a parallel-stranded tetraplex formed by the hexanucleotide d(TG4T) and stabilized by sodium cations was determined by x-ray crystallography to 1.2 angstroms resolution. Sharply resolved sodium cations were found between and within planes of hydrogen-bonded guanine quartets, and an ordered groove hydration was observed. Distinct intra- and intermolecular stacking arrangements were adopted by the guanine quartets. Thymine bases were exclusively involved in making extensive lattice contacts.

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Primary Citation of related structures