Solution structure of 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 

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This is version 1.3 of the entry. See complete history


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 U S A 112: 9608-9613

  • DOI: https://doi.org/10.1073/pnas.1422605112
  • Primary Citation of Related Structures:  
    2N16, 2N21

  • 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 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.


Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ATP-dependent RNA helicase DHX3620Homo sapiensMutation(s): 0 
EC: (PDB Primary Data), (PDB Primary Data)
UniProt & NIH Common Fund Data Resources
Find proteins for Q9H2U1 (Homo sapiens)
Explore Q9H2U1 
Go to UniProtKB:  Q9H2U1
GTEx:  ENSG00000174953 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9H2U1
Sequence Annotations
  • 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

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-07-29
    Type: Initial release
  • Version 1.1: 2015-08-05
    Changes: Database references, Structure summary
  • Version 1.2: 2022-08-24
    Changes: Data collection, Database references
  • Version 1.3: 2023-06-14
    Changes: Other