2MB2

parallel-stranded G-quadruplex in DNA poly-G stretches


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 10 
  • 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

Formation of g-quadruplexes in poly-g sequences: structure of a propeller-type parallel-stranded g-quadruplex formed by a g15 stretch.

Sengar, A.Heddi, B.Phan, A.T.

(2014) Biochemistry 53: 7718-7723

  • DOI: https://doi.org/10.1021/bi500990v
  • Primary Citation of Related Structures:  
    2MB2

  • PubMed Abstract: 

    Poly-G sequences are found in different genomes including human and have the potential to form higher-order structures with various applications. Previously, long poly-G sequences were thought to lead to multiple possible ways of G-quadruplex folding, rendering their structural characterization challenging. Here we investigate the structure of G-quadruplexes formed by poly-G sequences d(TTG(n)T), where n = 12 to 19. Our data show the presence of multiple and/or higher-order G-quadruplex structures in most sequences. Strikingly, NMR spectra of the TTG₁₅T sequence containing a stretch of 15 continuous guanines are exceptionally well-resolved and indicate the formation of a well-defined G-quadruplex structure. The NMR solution structure of this sequence revealed a propeller-type parallel-stranded G-quadruplex containing three G-tetrad layers and three single-guanine propeller loops. The same structure can potentially form anywhere along a long G(n) stretch, making it unique for molecular recognition by other cellular molecules.


  • Organizational Affiliation

    School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore 637371, Singapore.


Macromolecules

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Entity ID: 1
MoleculeChains LengthOrganismImage
DNA_(5'-D(*TP*TP*GP*GP*GP*GP*GP*GP*GP*GP*GP*GP*GP*GP*GP*GP*GP*T)-3')18N/A
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 lowest energy 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-12-03
    Type: Initial release
  • Version 1.1: 2015-01-07
    Changes: Database references
  • Version 1.2: 2023-06-14
    Changes: Data collection, Database references, Other
  • Version 1.3: 2024-05-15
    Changes: Data collection, Database references