2N21

Solution structure of complex between DNA G-quadruplex and G-quadruplex recognition domain of RHAU


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

Insights into G-quadruplex specific recognition by the DEAH-box helicase RHAU: Solution structure of a peptide-quadruplex complex.

Heddi, B.Cheong, V.V.Martadinata, H.Phan, A.T.

(2015) Proc.Natl.Acad.Sci.USA --: --

  • DOI: 10.1073/pnas.1422605112
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Four-stranded nucleic acid structures called G-quadruplexes have been associated with important cellular processes, which should require G-quadruplex-protein interaction. However, the structural basis for specific G-quadruplex recognition by proteins ...

    Four-stranded nucleic acid structures called G-quadruplexes have been associated with important cellular processes, which should require G-quadruplex-protein interaction. However, the structural basis for specific G-quadruplex recognition by proteins has not been understood. The DEAH (Asp-Glu-Ala-His) box RNA helicase associated with AU-rich element (RHAU) (also named DHX36 or G4R1) specifically binds to and resolves parallel-stranded G-quadruplexes. Here we identified an 18-amino acid G-quadruplex-binding domain of RHAU and determined the structure of this peptide bound to a parallel DNA G-quadruplex. Our structure explains how RHAU specifically recognizes parallel G-quadruplexes. The peptide covers a terminal guanine base tetrad (G-tetrad), and clamps the G-quadruplex using three-anchor-point electrostatic interactions between three positively charged amino acids and negatively charged phosphate groups. This binding mode is strikingly similar to that of most ligands selected for specific G-quadruplex targeting. Binding to an exposed G-tetrad represents a simple and efficient way to specifically target G-quadruplex structures.


    Organizational Affiliation

    School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371.,School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371 phantuan@ntu.edu.sg.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ATP-dependent RNA helicase DHX36
A
20Homo sapiensMutation(s): 0 
Gene Names: DHX36 (DDX36, KIAA1488, MLEL1, RHAU)
EC: 3.6.4.12, 3.6.4.13
Find proteins for Q9H2U1 (Homo sapiens)
Go to Gene View: DHX36
Go to UniProtKB:  Q9H2U1
Entity ID: 2
MoleculeChainsLengthOrganism
DNA (5'-D(*TP*TP*GP*GP*GP*TP*GP*GP*GP*TP*GP*GP*GP*TP*GP*GP*GP*T)-3')B18synthetic construct
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: 2015-07-29
    Type: Initial release
  • Version 1.1: 2015-08-05
    Type: Database references, Structure summary
  • Version 1.2: 2018-02-07
    Type: Experimental preparation