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DNA.RNA HYBRID DUPLEX CONTAINING A 5-PROPYNE DNA STRAND AND PURINE-RICH RNA STRAND, NMR, 4 STRUCTURES


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 
  • Conformers Submitted: 
  • Selection Criteria: all calculated structures submitted 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The solution structure of a DNA*RNA duplex containing 5-propynyl U and C; comparison with 5-Me modifications

Gyi, J.I.Gao, D.Conn, G.L.Trent, J.O.Brown, T.Lane, A.N.

(2003) Nucleic Acids Res. 31: 2683-2693


  • PubMed Abstract: 
  • The addition of the propynyl group at the 5 position of pyrimidine nucleotides is highly stabilising. We have determined the thermodynamic stability of the DNA.RNA hybrid r(GAAGAGAAGC)*d(GC(p)U(p)U(p)C(p)U(p) C(p)U(p)U(p)C) where p is the propynyl gr ...

    The addition of the propynyl group at the 5 position of pyrimidine nucleotides is highly stabilising. We have determined the thermodynamic stability of the DNA.RNA hybrid r(GAAGAGAAGC)*d(GC(p)U(p)U(p)C(p)U(p) C(p)U(p)U(p)C) where p is the propynyl group at the 5 position and compared it with that of the unmodified duplex and the effects of methyl substitutions. The incorporation of the propyne group at the 5 position gives rise to a very large stabilisation of the hybrid duplex compared with the analogous 5-Me modification. The duplexes have been characterised by gel electrophoresis and NMR spectroscopy, which indicate that methyl substitutions have a smaller influence on local and global conformation than the propynyl groups. The increased NMR spectral dispersion of the propyne-modified duplex allowed a larger number of experimental restraints to be measured. Restrained molecular dynamics in a fully solvated system showed that the propyne modification leads to substantial conformational rearrangements stabilising a more A-like structure. The propynyl groups occupy a large part of the major groove and make favourable van der Waals interactions with their nearest neighbours and the atoms of the rings. This enhanced overlap may account at least in part for the increased thermodynamic stability. Furthermore, the simulations show a spine of hydration in the major groove as well as in the minor groove involving the RNA hydroxyl groups.


    Related Citations: 
    • Comparison of the Thermodynamic Stabilities and Solution Conformations of DNA.RNA Hybrids Containing Purine-Rich and Pyrimidine-Rich Strands with DNA and RNA Duplexes
      Gyi, J.I.,Conn, G.L.,Lane, A.N.,Brown, T.
      (1996) Biochemistry 35: 12538
    • Solution Structures of DNA.RNA Hybrids with Purine-Rich and Pyrimidine-Rich Strands: Comparison with the Homologous DNA and RNA Duplexes
      Gyi, J.I.,Lane, A.N.,Conn, G.L.,Brown, T.
      (1998) Biochemistry 37: 73


    Organizational Affiliation

    Division of Molecular Structure, National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsLengthOrganism
5'-R(*GP*AP*AP*GP*AP*GP*AP*AP*GP*C)-3'A10N/A
Entity ID: 2
MoleculeChainsLengthOrganism
5'-D(*GP*(5PC)P*(PDU)P*(PDU)P*(5PC)P*(PDU)P*(5PC)P*(PDU)P*(PDU)P*C)-3'B10N/A
Small Molecules
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
PDU
Query on PDU
B
DNA LINKINGC12 H19 N2 O8 PDU
5PC
Query on 5PC
B
DNA LINKINGC12 H16 N3 O7 PDC
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 
  • Conformers Submitted: 
  • Selection Criteria: all calculated structures submitted 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-11-11
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance