2LPW

human CEB25 minisatellite G-quadruplex


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 1.2 of the entry. See complete history

Literature

Formation of Pearl-Necklace Monomorphic G-Quadruplexes in the Human CEB25 Minisatellite.

Amrane, S.Adrian, M.Heddi, B.Serero, A.Nicolas, A.Mergny, J.L.Phan, A.T.

(2012) J.Am.Chem.Soc. 134: 5807-5816

  • DOI: 10.1021/ja208993r

  • PubMed Abstract: 
  • CEB25 is a human minisatellite locus, composed of slightly polymorphic 52-nucleotide (nt) tandem repeats. Genetically, most if not all individuals of the human population are heterozygous, carrying alleles ranging from 0.5 to 20 kb, maintained by men ...

    CEB25 is a human minisatellite locus, composed of slightly polymorphic 52-nucleotide (nt) tandem repeats. Genetically, most if not all individuals of the human population are heterozygous, carrying alleles ranging from 0.5 to 20 kb, maintained by mendelian inheritance but also subject to germline instability. To provide insights on the biological role of CEB25, we interrogated its structural features. We report the NMR structure of the G-quadruplex formed by the conserved 26-nt G-rich fragment of the CEB25 motif. In K(+) solution, this sequence forms a propeller-type parallel-stranded G-quadruplex involving a 9-nt central double-chain-reversal loop. This long loop is anchored to the 5'-end of the sequence by an A·T Watson-Crick base pair and a potential G·A noncanonical base pair. These base pairs contribute to the stability of the overall G-quadruplexstructure, as measured by an increase of about 17 kcal/mol in enthalpy or 6 °C in melting temperature. Further, we demonstrate that such a monomorphic structure is formed within longer sequence contexts folding into a pearl-necklace structure.


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsLengthOrganism
DNA (26-MER)A26N/A
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-03-07
    Type: Initial release
  • Version 1.1: 2012-04-04
    Type: Database references
  • Version 1.2: 2012-04-18
    Type: Database references