6ALT

Solution structure of a DNA dodecamer with 5-methylcytosine at the 3rd and 9th position


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 18 
  • Conformers Submitted: 11 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Oxidative damage to epigenetically methylated sites affects DNA stability, dynamics and enzymatic demethylation.

Gruber, D.R.Toner, J.J.Miears, H.L.Shernyukov, A.V.Kiryutin, A.S.Lomzov, A.A.Endutkin, A.V.Grin, I.R.Petrova, D.V.Kupryushkin, M.S.Yurkovskaya, A.V.Johnson, E.C.Okon, M.Bagryanskaya, E.G.Zharkov, D.O.Smirnov, S.L.

(2018) Nucleic Acids Res 46: 10827-10839

  • DOI: 10.1093/nar/gky893
  • Primary Citation of Related Structures:  
    6ALT, 6ALS, 6ALU, 5L06, 5L2G, 5UZ3, 5UZ2, 5UZ1, 5TRN

  • PubMed Abstract: 
  • DNA damage can affect various regulatory elements of the genome, with the consequences for DNA structure, dynamics, and interaction with proteins remaining largely unexplored. We used solution NMR spectroscopy, restrained and free molecular dynamics to obtain the structures and investigate dominant motions for a set of DNA duplexes containing CpG sites permuted with combinations of 5-methylcytosine (mC), the primary epigenetic base, and 8-oxoguanine (oxoG), an abundant DNA lesion ...

    DNA damage can affect various regulatory elements of the genome, with the consequences for DNA structure, dynamics, and interaction with proteins remaining largely unexplored. We used solution NMR spectroscopy, restrained and free molecular dynamics to obtain the structures and investigate dominant motions for a set of DNA duplexes containing CpG sites permuted with combinations of 5-methylcytosine (mC), the primary epigenetic base, and 8-oxoguanine (oxoG), an abundant DNA lesion. Guanine oxidation significantly changed the motion in both hemimethylated and fully methylated DNA, increased base pair breathing, induced BI→BII transition in the backbone 3' to the oxoG and reduced the variability of shift and tilt helical parameters. UV melting experiments corroborated the NMR and molecular dynamics results, showing significant destabilization of all methylated contexts by oxoG. Notably, some dynamic and thermodynamic effects were not additive in the fully methylated oxidized CpG, indicating that the introduced modifications interact with each other. Finally, we show that the presence of oxoG biases the recognition of methylated CpG dinucleotides by ROS1, a plant enzyme involved in epigenetic DNA demethylation, in favor of the oxidized DNA strand. Thus, the conformational and dynamic effects of spurious DNA oxidation in the regulatory CpG dinucleotide can have far-reaching biological consequences.


    Organizational Affiliation

    Chemistry Department, Western Washington University, 516 High St., Bellingham, WA 98225-9150, USA.



Macromolecules
  • Find similar nucleic acids by:  Sequence   |   Structure
  • Entity ID: 1
    MoleculeChainsLengthOrganismImage
    DNA (5'-D(*(DC5)P*GP*(DMC)P*GP*AP*AP*TP*TP*(DMC)P*GP*CP*(DG3))-3')A, B12synthetic construct
    Protein Feature View
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    • Reference Sequence
    Experimental Data & Validation

    Experimental Data

    • Method: SOLUTION NMR
    • Conformers Calculated: 18 
    • Conformers Submitted: 11 
    • Selection Criteria: structures with the lowest energy 
    • OLDERADO: 6ALT Olderado

    Structure Validation

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    Entry History & Funding Information

    Deposition Data


    Funding OrganizationLocationGrant Number
    National Science Foundation (NSF, United States)United States1244641

    Revision History  (Full details and data files)

    • Version 1.0: 2017-09-20
      Type: Initial release
    • Version 1.1: 2017-09-27
      Changes: Author supporting evidence
    • Version 1.2: 2018-12-19
      Changes: Data collection, Database references
    • Version 1.3: 2019-11-27
      Changes: Author supporting evidence, Data collection