1KKW

NMR Solution Structure of d(CCATGCGTGG)2, G-T mismatch structure


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 20 
  • Conformers Submitted: 20 
  • Selection Criteria: all calculated structures submitted, back calculated data agree with experimental NOESY spectrum 

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This is version 1.3 of the entry. See complete history


Literature

Structural differences in the NOE-derived structure of G-T mismatched DNA relative to normal DNA are correlated with differences in (13)C relaxation-based internal dynamics.

Isaacs, R.J.Rayens, W.S.Spielmann, H.P.

(2002) J Mol Biol 319: 191-207

  • DOI: 10.1016/S0022-2836(02)00265-6
  • Primary Citation of Related Structures:  
    1KKV, 1KKW

  • PubMed Abstract: 
  • Detailed description of the characteristics of mismatched DNA that are distinct from normal DNA is vital to the understanding of how mismatch repair proteins are able to recognize and repair these DNA lesions. To this end, we have used nuclear Overhauser effect spectroscopy (NOESY)-based distance restraints and (13)C relaxation measurements to solve the solution structures and measure some of the internal dynamics of the G-T mismatched DNA oligomer d(CCATGCGTGG)(2) (GT) and its parent DNA sequence d(CCACGCGTGG)(2) (GC) ...

    Detailed description of the characteristics of mismatched DNA that are distinct from normal DNA is vital to the understanding of how mismatch repair proteins are able to recognize and repair these DNA lesions. To this end, we have used nuclear Overhauser effect spectroscopy (NOESY)-based distance restraints and (13)C relaxation measurements to solve the solution structures and measure some of the internal dynamics of the G-T mismatched DNA oligomer d(CCATGCGTGG)(2) (GT) and its parent DNA sequence d(CCACGCGTGG)(2) (GC). In GT, the mismatched G7 is structurally perturbed much more than the mismatched T4 relative to their corresponding bases in GC. The degree of G7 displacement differs from previous high-resolution structures of G-T mismatch-containing B-DNA, suggesting a dependence of G-T mismatch-induced structural perturbation on sequence context. The internal dynamics of GC and GT differ on multiple timescales. The mismatched G7 of GT contains spins that decrease significantly in order in GT compared to GC, while spins in C6, T8, and A3 have significantly higher order in GT compared to GC. Linear correlations between helical parameters of GC and GT and the order of C-1' and aromatic methine carbon atoms relate differences in internal dynamics to the structures quantitatively. The dynamic differences between the normal and mismatched DNA signify changes in local flexibility that may be exploited by the mismatch repair system to bind mismatched DNA preferentially while ignoring normal DNA.


    Organizational Affiliation

    Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, KY 40536-0084, USA.



Macromolecules

Find similar nucleic acids by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChainsLengthOrganismImage
5'-D(*CP*CP*AP*TP*GP*CP*GP*TP*GP*G)-3'A, B10N/A
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 20 
  • Conformers Submitted: 20 
  • Selection Criteria: all calculated structures submitted, back calculated data agree with experimental NOESY spectrum 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-06-19
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2022-02-23
    Changes: Data collection, Database references, Derived calculations