1S2R image
Deposition Date 2004-01-09
Release Date 2005-01-04
Last Version Date 2024-02-14
Entry Detail
PDB ID:
1S2R
Keywords:
DNA
Title:
A High Resolution Crystal Structure of [d(CGCAAATTTGCG)]2
Biological Source:
Source Organism:
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
1.53 Å
R-Value Free:
0.23
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 21 21 21
1S2R validation report
Macromolecular Entities
Polymer Type:polydeoxyribonucleotide
Molecule:5'-D(*CP*GP*CP*AP*AP*AP*TP*TP*TP*GP*CP*G)-3'
Chain IDs:A, B
Chain Length:12
Number of Molecules:2
Biological Source:
Ligand Molecules
SPM
Primary Citation
High-resolution structure of an extended A-tract: [d(CGCAAATTTGCG)]2.
J.Am.Chem.Soc. 126 15330 15331 (2004)
PMID: 15563130 DOI: 10.1021/ja045207x

Abstact

The crystal structure of [d(CGCAAATTTGCG)]2 has been determined to 1.5 A resolution, representing the first high-resolution structure of this DNA fragment. The ion interactions are novel. A spermine molecule replaces a Mg2+ observed in analogous structures. Unlike lower-resolution structures, the minor groove is narrow and the major groove lacks extra Watson-Crick hydrogen bonds. In addition, a monolayer of solvent sites, including a "spine of hydration", is visible in the minor groove. The crystal of [d(CGCAAATTTGCG)]2 was grown from a solution containing spermine, magnesium, and lithium. The conformation recapitulates that of "monovalent-minus" DNA.

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Primary Citation of related structures
1S2R