5LQG

A two-quartet G-quadruplex formed by human telomere in KCl solution at neutral pH


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the least restraint violations 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Reversible pH Switch of Two-Quartet G-Quadruplexes Formed by Human Telomere.

Galer, P.Wang, B.Sket, P.Plavec, J.

(2016) Angew Chem Int Ed Engl 55: 1993-1997

  • DOI: https://doi.org/10.1002/anie.201507569
  • Primary Citation of Related Structures:  
    5LQG, 5LQH

  • PubMed Abstract: 

    A four-repeat human telomere DNA sequence without the 3'-end guanine, d[TAGGG(TTAGGG)2 TTAGG] (htel1-ΔG23) has been found to adopt two distinct two G-quartet antiparallel basket-type G-quadruplexes, TD and KDH(+) in presence of KCl. NMR, CD, and UV spectroscopy have demonstrated that topology of KDH(+) form is distinctive with unique protonated T18⋅A20(+) ⋅G5 base triple and other capping structural elements that provide novel insight into structural polymorphism and heterogeneity of G-quadruplexes in general. Specific stacking interactions amongst two G-quartets flanking base triples and base pairs in TD and KDH(+) forms are reflected in 10 K higher thermal stability of KDH(+) . Populations of TD and KDH(+) forms are controlled by pH. The (de)protonation of A20 is the key for pH driven structural transformation of htel1-ΔG23. Reversibility offers possibilities for its utilization as a conformational switch within different compartments of living cell enabling specific ligand and protein interactions.


  • Organizational Affiliation

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


Macromolecules

Find similar nucleic acids by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains LengthOrganismImage
DNA (5'-D(*TP*AP*GP*GP*GP*TP*TP*AP*GP*GP*GP*TP*TP*AP*GP*GP*GP*TP*TP*AP*GP*G)-3')22Homo sapiens
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the least restraint violations 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Slovenian Research AgencySloveniaP1-0242
Slovenian Research AgencySloveniaJ1-6733
Slovenian Research AgencySloveniaJ1-7108

Revision History  (Full details and data files)

  • Version 1.0: 2018-06-13
    Type: Initial release
  • Version 1.1: 2019-05-08
    Changes: Data collection
  • Version 1.2: 2019-06-19
    Changes: Data collection
  • Version 1.3: 2019-08-07
    Changes: Data collection, Database references
  • Version 1.4: 2024-05-15
    Changes: Data collection, Database references