Human telomeric G-quadruplex with 8-oxo-G substitution in the central G-quartet

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 12 
  • Selection Criteria: structures with the lowest energy 

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This is version 1.3 of the entry. See complete history


Impact of Oxidative Lesions on the Human Telomeric G-Quadruplex.

Bielskute, S.Plavec, J.Podbevsek, P.

(2019) J Am Chem Soc 141: 2594-2603

  • DOI: https://doi.org/10.1021/jacs.8b12748
  • Primary Citation of Related Structures:  
    6IA0, 6IA4

  • PubMed Abstract: 

    Telomere attrition is closely associated with cell aging and exposure to reactive oxygen species (ROS). While oxidation products of nucleotides have been studied extensively in the past, the underlying secondary/tertiary structural changes in DNA remain poorly understood. In this work, we systematically probed guanine positions in the human telomeric oligonucleotide sequence (hTel) by substitutions with the major product of ROS, 8-oxo-7,8-dihydroguanine ( oxo G), and evaluated the G-quadruplex forming ability of such oligonucleotides. Due to reduced hydrogen-bonding capability caused by oxo G, a loss of G-quadruplex structure was observed for most oligonucleotides containing oxidative lesions. However, some positions in the hTel sequence were found to tolerate substitutions with oxo G. Due to oxo G's preference for the syn conformation, distinct responses were observed when replacing guanines with different glycosidic conformations. Accommodation of oxo G at sites originally in syn or anti in nonsubstituted hTel G-quadruplex requires a minor structural rearrangement or a major conformational shift, respectively. The system responds by retaining or switching to a fold where oxo G is in syn conformation. Most importantly, these G-quadruplex structures are still stable at physiological temperatures and should be considered detrimental in higher-order telomere structures.

  • Organizational Affiliation

    Slovenian NMR Center , National Institute of Chemistry , Hajdrihova 19 , SI-1000 Ljubljana , Slovenia.


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Entity ID: 1
MoleculeChains LengthOrganismImage
hTel-oxoG1024Homo sapiens
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 12 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Slovenian Research AgencySloveniaP1-0242
Slovenian Research AgencySloveniaJ3-6800
Slovenian Research AgencySloveniaJ1-6733

Revision History  (Full details and data files)

  • Version 1.0: 2019-01-30
    Type: Initial release
  • Version 1.1: 2019-02-20
    Changes: Data collection, Database references
  • Version 1.2: 2019-05-08
    Changes: Data collection
  • Version 1.3: 2023-06-14
    Changes: Database references, Other