1DA2

MOLECULAR AND CRYSTAL STRUCTURE OF D(CGCGMO4CG): N4-METHOXYCYTOSINE/GUANINE BASE-PAIRS IN Z-DNA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Observed: 0.181 

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This is version 1.2 of the entry. See complete history


Literature

Molecular and crystal structure of d(CGCGmo4CG): N4-methoxycytosine.guanine base-pairs in Z-DNA.

Van Meervelt, L.Moore, M.H.Lin, P.K.Brown, D.M.Kennard, O.

(1990) J Mol Biol 216: 773-781

  • DOI: 10.1016/0022-2836(90)90398-6
  • Primary Citation of Related Structures:  
    1DA2

  • PubMed Abstract: 
  • The base analogue N4-methoxycytosine (mo4C) is ambivalent in its hydrogen-bonding potential, since it forms stable base-pairs with both adenine and guanine in oligomer duplexes. To investigate the base-pair geometry, the structure of d(CGCGmo4CG) has been determined by single-crystal X-ray diffraction techniques ...

    The base analogue N4-methoxycytosine (mo4C) is ambivalent in its hydrogen-bonding potential, since it forms stable base-pairs with both adenine and guanine in oligomer duplexes. To investigate the base-pair geometry, the structure of d(CGCGmo4CG) has been determined by single-crystal X-ray diffraction techniques. The d(CGCGmo4CG)2 crystallized in a left-handed double helical structure (Z-type). Refinement using 2559 reflections between 10 and 1.7 A converged with a final R = 0.181 (Rw = 0.130) including 68 solvent molecules. The orthorhombic crystals are in the space group P2(1)2(1)2(1), with cell dimensions a = 18.17 A, b = 30.36 A, c = 43.93 A. The mo4C.G base-pair is of the wobble type, with mo4C in the imino form, and the methoxy group in the syn configuration.


    Organizational Affiliation

    University of Chemical Laboratory, Cambridge, U.K.



Macromolecules
  • Find similar nucleic acids by:  Sequence   |   Structure
  • Entity ID: 1
    MoleculeChainsLengthOrganismImage
    DNA (5'-D(*CP*GP*CP*GP*(C45)P*G)-3')A, B6N/A
    Protein Feature View
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    • Reference Sequence
    Experimental Data & Validation

    Experimental Data

    • Method: X-RAY DIFFRACTION
    • Resolution: 1.70 Å
    • R-Value Observed: 0.181 
    • Space Group: P 21 21 21
    Unit Cell:
    Length ( Å )Angle ( ˚ )
    a = 18.17α = 90
    b = 30.36β = 90
    c = 43.93γ = 90
    Software Package:
    Software NamePurpose
    NUCLSQrefinement

    Structure Validation

    View Full Validation Report




    Entry History 

    Deposition Data

    Revision History  (Full details and data files)

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