1P3X

INTRAMOLECULAR DNA TRIPLEX WITH 1-PROPYNYL DEOXYURIDINE IN THE THIRD STRAND, NMR, 10 STRUCTURES


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 30 
  • Conformers Submitted: 10 
  • Selection Criteria: LOWEST OVERALL ENERGY 

wwPDB Validation   3D Report Full Report


This is version 2.0 of the entry. See complete history


Literature

Solution structure of an intramolecular DNA triplex containing 5-(1-propynyl)-2'-deoxyuridine residues in the third strand.

Phipps, A.K.Tarkoy, M.Schultze, P.Feigon, J.

(1998) Biochemistry 37: 5820-5830

  • DOI: https://doi.org/10.1021/bi972811u
  • Primary Citation of Related Structures:  
    1P3X

  • PubMed Abstract: 

    Incorporation of the modified base 5-(1-propynl)-2'-deoxyuridine (propynylU) in the third strand of a triplex leads to enhanced triplex stabilization. To investigate effects of the propyne nucleotide on triplex structure and the factors underlying the increased stability, we have determined the solution structure of the intramolecular DNA pyrmidine-purine-pyrimdine d(AGAGAGAA-(EG)6-TTCTCTCT-(EG)6-PCPCPCPP) (PDD-EG), which contains 5-(1-propynl)-2'-deoxyuridine (P) in the third strand and hexakis(ethylene glycol) linkers [(EG)6]. The structure was calculated using X-PLOR with distance and dihedral angle restraints obtained from two-dimensional NMR experiments and refined with the direct relaxation matrix method. The structures show that the extended aromatic electron cloud of the propynylU nucleotide stacks well over the 5'-neighboring nucleotides, resulting in increased stabilization. The propynylU nucleotides also affect the overall structure of the triple helix. A comparison of the structure to that of the nonmodified intramolecular DNA triplex of the same sequence, d(AGAGAGAA-(EG)6-TTCTCTCT-(EG)6-TCTCTCTT) (DDD-EG), shows that PDD-EG has a more A-DNA like X displacement and inclination than DDD-EG yet still maintains predominantly S-type sugar puckers as found in DDD-EG and other DNA triplexes.


  • Organizational Affiliation

    Department of Chemistry and Biochemistry, Molecular Biology Institute, University of California, Los Angeles 90095-1569, USA.


Macromolecules

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Entity ID: 1
MoleculeChains LengthOrganismImage
DNA (5'-D(*AP*GP*AP*GP*AP*GP*AP*A)-3')8N/A
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains LengthOrganismImage
DNA (5'-D(*TP*TP*CP*TP*CP*TP*CP*T)-3')8N/A
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 30 
  • Conformers Submitted: 10 
  • Selection Criteria: LOWEST OVERALL ENERGY 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1998-05-06
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 2.0: 2021-07-28
    Changes: Advisory, Atomic model, Derived calculations, Non-polymer description, Other, Structure summary