9I5S | pdb_00009i5s

Solution structure of an intramolecular anti-parallel G-quadruplex with a 5'-end overhang.

  • Classification: DNA
  • Organism(s): Homo sapiens
  • Mutation(s): No 

  • Deposited: 2025-01-28 Released: 2025-12-10 
  • Deposition Author(s): Avendano Avila, C., Heddi, B.
  • Funding Organization(s): Agence Nationale de la Recherche (ANR)

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 10 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history. 


Literature

An antiparallel G-quadruplex structure with a 5'-end overhang forms predominantly at the human telomeric ds-ss DNA junction.

Avendano Avila, C., Heddi, B.

(2025) Chem Commun (Camb) 61: 17661-17664

  • DOI: https://doi.org/10.1039/d5cc03633j
  • Primary Citation of Related Structures:  
    9I5S

  • PubMed Abstract: 

    G-quadruplex structures formed by human telomeric sequences are highly sensitive to subtle sequence variations and local environment. While most structural studies have focused on sequences containing four uninterrupted G-tracts, the structural consequences of splitting a G-tract remain unexplored. Here, we present the NMR solution structure of a human telomeric sequence with the first G-tract split. The structure adopts an antiparallel topology with a disordered GTT segment at the 5'-end. This conformation is preferentially formed at a biologically relevant double-strand/single-strand DNA junction. These findings broaden our understanding of the structural diversity of human telomeric G-quadruplexes.

    • Organizational Affiliation: 
    • Laboratoire de Biologie et Pharmacologie Appliquée (LBPA), UMR8113 CNRS, ENS Paris-Saclay, Université Paris-Saclay, 4 Avenue des sciences, F-91190 Gif-sur-Yvette, France. brahim.heddi@ens-paris-saclay.fr.

Macromolecules

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Entity ID: 1
MoleculeChains LengthOrganismImage
Human telomeric DNA G-quadruplex hteloS1[11]24Homo sapiens
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 10 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Agence Nationale de la Recherche (ANR)France--

Revision History  (Full details and data files)

  • Version 1.0: 2025-12-10
    Type: Initial release