Experimental Data Snapshot

  • Resolution: 1.40 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.197 

wwPDB Validation   3D Report Full Report

Ligand Structure Quality Assessment 

This is version 1.3 of the entry. See complete history


The B-DNA dodecamer at high resolution reveals a spine of water on sodium.

Shui, X.McFail-Isom, L.Hu, G.G.Williams, L.D.

(1998) Biochemistry 37: 8341-8355

  • DOI: https://doi.org/10.1021/bi973073c
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    We describe a very accurate addition (called structure X here) to the B-DNA dodecamer family of X-ray structures. Our results confirm the observation of Drew and Dickerson [(1981) J. Mol. Biol. 151, 535-556] that the spine of hydration in AT tract DNA is two layers deep. However, our results suggest that the primary spine is partially occupied by sodium ions. We suggest that many sequence-dependent features of DNA conformation are mediated by site specific binding of cations. For example, preferential localization of cations, as described here within the minor groove of structure X, is probably the structural origin of AT tract bending and groove narrowing. The secondary spine, which does not interact directly with the DNA, is as geometrically regular as the primary spine, providing a model for transmission of sequence information into solvent regions. A fully hydrated magnesium ion located in the major groove of structure X appears to pull cytosine bases partially out from the helical stack, exposing pi-systems to partial positive charges of the magnesium ion and its outer sphere. A partially ordered spermine molecule is located within the major groove of structure X. Dodecamer structures are derived from crystals of [d(CGCGAATTCGCG)]2 in space group P212121 (a = 25 A, b = 40 A, and c = 66 A). On average, those crystals diffracted to around 2.5 A resolution with 2500 unique reflections. Structure X, with the same space group, DNA sequence, and crystal form as the "Dickerson dodecamer", is refined against a complete, low-temperature, 1.4 A resolution data set, with over 11000 reflections. Structure X appears to be conformationally more ordered than previous structures, suggesting that at least a portion of the conformational heterogeneity previously attributed to DNA sequence in fact arises from experimental error.

  • Organizational Affiliation

    School of Chemistry & Biochemistry, Georgia Institute of Technology, Atlanta 30332-0400, USA.


Find similar nucleic acids by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains LengthOrganismImage
A, B
12synthetic construct
Sequence Annotations
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Resolution: 1.40 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.197 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 25.186α = 90
b = 40.208β = 90
c = 65.656γ = 90
Software Package:
Software NamePurpose
ADSCdata collection

Structure Validation

View Full Validation Report

Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1997-10-13
    Type: Initial release
  • Version 1.1: 2008-05-22
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-08-02
    Changes: Database references, Derived calculations, Refinement description