1AC7

STRUCTURAL FEATURES OF THE DNA HAIRPIN D(ATCCTAGTTATAGGAT): THE FORMATION OF A G-A BASE PAIR IN THE LOOP, NMR, 10 STRUCTURES


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 400 
  • Conformers Submitted: 10 
  • Selection Criteria: LOW ENERGY 

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This is version 1.2 of the entry. See complete history


Literature

Structural features of the DNA hairpin d(ATCCTA-GTTA-TAGGAT): formation of a G-A base pair in the loop.

van Dongen, M.J.Mooren, M.M.Willems, E.F.van der Marel, G.A.van Boom, J.H.Wijmenga, S.S.Hilbers, C.W.

(1997) Nucleic Acids Res 25: 1537-1547

  • DOI: 10.1093/nar/25.8.1537
  • Primary Citation of Related Structures:  
    1AC7

  • PubMed Abstract: 
  • The three-dimensional structure of the hairpin formed by d(ATCCTA-GTTA-TAGGAT) has been determined by means of two-dimensional NMR studies, distance geometry and molecular dynamics calculations. The first and the last residues of the tetraloop of this hairpin form a sheared G-A base pair on top of the six Watson-Crick base pairs in the stem ...

    The three-dimensional structure of the hairpin formed by d(ATCCTA-GTTA-TAGGAT) has been determined by means of two-dimensional NMR studies, distance geometry and molecular dynamics calculations. The first and the last residues of the tetraloop of this hairpin form a sheared G-A base pair on top of the six Watson-Crick base pairs in the stem. The glycosidic torsion angles of the guanine and adenine residues in the G-A base pair reside in the anti and high- anti domain ( approximately -60 degrees ) respectively. Several dihedral angles in the loop adopt non-standard values to accommodate this base pair. The first and second residue in the loop are stacked in a more or less normal helical fashion; the fourth loop residue also stacks upon the stem, while the third residue is directed away from the loop region. The loop structure can be classified as a so-called type-I loop, in which the bases at the 5'-end of the loop stack in a continuous fashion. In this situation, loop stability is unlikely to depend heavily on the nature of the unpaired bases in the loop. Moreover, the present study indicates that the influence of the polarity of a closing A.T pair is much less significant than that of a closing C.G base pair.


    Organizational Affiliation

    NSR Centre for Molecular Structure, Design and Synthesis, Laboratory of Biophysical Chemistry, University of Nijmegen, Nijmegen, The Netherlands.



Macromolecules
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  • Entity ID: 1
    MoleculeChainsLengthOrganismImage
    DNA (5'-D(*AP*TP*CP*CP*TP*AP*GP*TP*TP*AP*TP*AP*GP*GP*AP*T)-3')A16N/A
    Protein Feature View
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    • Reference Sequence
    Experimental Data & Validation

    Experimental Data

    • Method: SOLUTION NMR
    • Conformers Calculated: 400 
    • Conformers Submitted: 10 
    • Selection Criteria: LOW ENERGY 
    • OLDERADO: 1AC7 Olderado

    Structure Validation

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    Entry History 

    Deposition Data

    Revision History  (Full details and data files)

    • Version 1.0: 1997-07-07
      Type: Initial release
    • Version 1.1: 2008-03-24
      Changes: Version format compliance
    • Version 1.2: 2011-07-13
      Changes: Version format compliance