117D

CRYSTAL AND MOLECULAR STRUCTURE OF THE ALTERNATING DODECAMER D(GCGTACGTACGC) IN THE A-DNA FORM: COMPARISON WITH THE ISOMORPHOUS NON-ALTERNATING DODECAMER D(CCGTACGTACGG)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Observed: 0.142 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal and molecular structure of the alternating dodecamer d(GCGTACGTACGC) in the A-DNA form: comparison with the isomorphous non-alternating dodecamer d(CCGTACGTACGG).

Bingman, C.Jain, S.Zon, G.Sundaralingam, M.

(1992) Nucleic Acids Res 20: 6637-6647

  • DOI: 10.1093/nar/20.24.6637
  • Primary Citation of Related Structures:  
    117D

  • PubMed Abstract: 
  • The crystal structure of the alternating dodecamer d(GCGTACGTACGC) (5'-GC) has been determined to a resolution of 2.55A using oscillation film data. The crystals belong to space group P6(1) 22, a = b = 46.2A, c = 71.5A with one strand in the asymmetric unit, and are isomorphous with a previously described non-alternating dodecamer, d(CCGTACGTACGG) (5'-CC) ...

    The crystal structure of the alternating dodecamer d(GCGTACGTACGC) (5'-GC) has been determined to a resolution of 2.55A using oscillation film data. The crystals belong to space group P6(1) 22, a = b = 46.2A, c = 71.5A with one strand in the asymmetric unit, and are isomorphous with a previously described non-alternating dodecamer, d(CCGTACGTACGG) (5'-CC). Refinement by X-PLOR/NUCLSQ gave a final R factor of 14.2% for 1089 observations. The molecule adopts the A-DNA form. The interchange of the terminal base pairs in the two dodecamers results in differences in the intermolecular contacts and may account for the differences in the bending. This dodecamer shows an axial deflection of 30 degrees, in the direction of the major groove compared to 20 degrees in 5'-CC and may be a consequence of additional contacts generated in 5'-GC by the interchange of end base pairs. The high helical axis deflection appreciably influences the local helical parameters. The molecule exhibits relatively high inclination angles, and has a narrow major groove. The helical parameters when described relative to the dyad-related hexamer halves of the molecule give more reasonable values. The crystal packing, local helical parameters, torsion angles, and hydration are described and also compared with the non-alternating 5'-CC dodecamer.


    Related Citations: 
    • Crystal and Molecular Structure of the A-DNA Dodecamer d(CCGTACGTACGG): Choice of Fragment Helical Axis
      Bingman, C.A., Zon, G., Sundaralingam, M.
      (1992) J Mol Biol 227: 738

    Organizational Affiliation

    Department of Biochemistry, University of Wisconsin, Madison 53706.



Macromolecules
  • Find similar nucleic acids by:  Sequence   |   Structure
  • Entity ID: 1
    MoleculeChainsLengthOrganismImage
    DNA (5'-D(*GP*CP*GP*TP*AP*CP*GP*TP*AP*CP*GP*C)-3')A12N/A
    Protein Feature View
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    • Reference Sequence
    Experimental Data & Validation

    Experimental Data

    • Method: X-RAY DIFFRACTION
    • Resolution: 2.55 Å
    • R-Value Observed: 0.142 
    • Space Group: P 61 2 2
    Unit Cell:
    Length ( Å )Angle ( ˚ )
    a = 46.2α = 90
    b = 46.2β = 90
    c = 71.5γ = 120
    Software Package:
    Software NamePurpose
    NUCLSQrefinement

    Structure Validation

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    Entry History 

    Deposition Data

    Revision History  (Full details and data files)

    • Version 1.0: 1993-04-15
      Type: Initial release
    • Version 1.1: 2008-05-22
      Changes: Version format compliance
    • Version 1.2: 2011-07-13
      Changes: Version format compliance