Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 8.09 kDa 
• Atom Count: 546 
• Modelled Residue Count: 38 
• Deposited Residue Count: 38 
• Unique protein chains: 1
• Unique nucleic acid chains: 1

 2N21

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

• PDB DOI:  https://doi.org/10.2210/pdb2N21/pdb
• NDB: 2N21
• BMRB: 25582

• Classification: HYDROLASE/DNA
• Organism(s): Homo sapiens, synthetic construct
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2015-04-25 Released: 2015-07-29 
• Deposition Author(s): Heddi, B., Cheong, V.V., Martadinata, H., Phan, A.T.

---

Experimental Data Snapshot

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

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 U S A 112: 9608-9613

• PubMed: 26195789 
• 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 [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ATP-dependent RNA helicase DHX36	A	20	Homo sapiens	Mutation(s): 0  Gene Names: DHX36, DDX36, KIAA1488, MLEL1, RHAU EC: 3.6.4.12 (PDB Primary Data), 3.6.4.13 (PDB Primary Data)
UniProt & NIH Common Fund Data Resources
Find proteins for Q9H2U1 (Homo sapiens) Explore Q9H2U1  Go to UniProtKB:  Q9H2U1
PHAROS:  Q9H2U1

Entity ID: 2
Molecule	Chains	Length	Organism	Image
DNA (5'-D(*TP*TP*GP*GP*GP*TP*GP*GP*GP*TP*GP*GP*GP*TP*GP*GP*GP*T)-3')	B	18	synthetic construct

Experimental Data & Validation

Experimental Data

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

Structure Validation

Entry History 

Deposition Data

• Released Date: 2015-07-29 
Deposition Author(s): Heddi, B., Cheong, V.V., Martadinata, H., Phan, A.T.

Revision History  

• Version 1.0: 2015-07-29
  Type: Initial release
  
• Version 1.1: 2015-08-05
  Changes: Database references, Structure summary
• Version 1.2: 2018-02-07
  Changes: Experimental preparation
• Version 1.3: 2022-08-24
  Changes: Data collection, Database references