Racemic crystal structure of a calcium-bound DNA four-way junction

Experimental Data Snapshot

  • Resolution: 2.33 Å
  • R-Value Free: 0.341 
  • R-Value Work: 0.285 
  • R-Value Observed: 0.289 

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This is version 1.3 of the entry. See complete history


Racemic DNA crystallography.

Mandal, P.K.Collie, G.W.Kauffmann, B.Huc, I.

(2014) Angew Chem Int Ed Engl 53: 14424-14427

  • DOI: https://doi.org/10.1002/anie.201409014
  • Primary Citation of Related Structures:  
    4R44, 4R45, 4R47, 4R48, 4R49, 4R4A, 4R4D

  • PubMed Abstract: 

    Racemates increase the chances of crystallization by allowing molecular contacts to be formed in a greater number of ways. With the advent of protein synthesis, the production of protein racemates and racemic-protein crystallography are now possible. Curiously, racemic DNA crystallography had not been investigated despite the commercial availability of L- and D-deoxyribo-oligonucleotides. Here, we report a study into racemic DNA crystallography showing the strong propensity of racemic DNA mixtures to form racemic crystals. We describe racemic crystal structures of various DNA sequences and folded conformations, including duplexes, quadruplexes, and a four-way junction, showing that the advantages of racemic crystallography should extend to DNA.

  • Organizational Affiliation

    Université de Bordeaux, CBMN, UMR5248, Institut Européen de Chimie et Biologie, 2 rue Robert Escarpit, 33600 Pessac (France); CNRS, CBMN, UMR5248.


Find similar nucleic acids by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains LengthOrganismImage
A, B
10synthetic construct
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.33 Å
  • R-Value Free: 0.341 
  • R-Value Work: 0.285 
  • R-Value Observed: 0.289 
  • Space Group: C 1 2/c 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 65.95α = 90
b = 23.355β = 115.47
c = 72.907γ = 90
Software Package:
Software NamePurpose
DNAdata collection
XDSdata reduction
d*TREKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-11-12
    Type: Initial release
  • Version 1.1: 2015-01-14
    Changes: Database references
  • Version 1.2: 2019-08-28
    Changes: Data collection, Derived calculations
  • Version 1.3: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description