4PXA

DEAD-box RNA helicase DDX3X Cancer-associated mutant D354V

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.206 

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Literature

Cancer-Associated Mutants of RNA Helicase DDX3X Are Defective in RNA-Stimulated ATP Hydrolysis.

Epling, L.B., Grace, C.R., Lowe, B.R., Partridge, J.F., Enemark, E.J.

(2015) J Mol Biol 427: 1779-1796

  • DOI: 10.1016/j.jmb.2015.02.015
  • Primary Citation of Related Structures:  
    4PX9, 4PXA

  • PubMed Abstract: 

    • The DEAD-box RNA helicase DDX3X is frequently mutated in pediatric medulloblastoma. We dissect how these mutants affect DDX3X function with structural, biochemical, and genetic experiments. We identify an N-terminal extension ("ATP-binding loop", ABL) that is critical for the stimulation of ATP hydrolysis by RNA ...

    The DEAD-box RNA helicase DDX3X is frequently mutated in pediatric medulloblastoma. We dissect how these mutants affect DDX3X function with structural, biochemical, and genetic experiments. We identify an N-terminal extension ("ATP-binding loop", ABL) that is critical for the stimulation of ATP hydrolysis by RNA. We present crystal structures suggesting that the ABL interacts dynamically with ATP and confirming that the interaction occurs in solution by NMR chemical shift perturbation and isothermal titration calorimetry. DEAD-box helicases require interaction between two conserved RecA-like helicase domains, D1 and D2 for function. We use NMR chemical shift perturbation to show that DDX3X interacts specifically with double-stranded RNA through its D1 domain, with contact mediated by residues G302 and G325. Mutants of these residues, G302V and G325E, are associated with pediatric medulloblastoma. These mutants are defective in RNA-stimulated ATP hydrolysis. We show that DDX3X complements the growth defect in a ded1 temperature-sensitive strain of Schizosaccharomyces pombe, but the cancer-associated mutants G302V and G325E do not complement and exhibit protein expression defects. Taken together, our results suggest that impaired translation of important mRNA targets by mutant DDX3X represents a key step in the development of medulloblastoma.

    Organizational Affiliation: 

    Program in Biomedical Sciences, University of Tennessee Health Science Center, 858 Madison Ave., Memphis, TN 38163, USA.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ATP-dependent RNA helicase DDX3XA467Homo sapiensMutation(s): 1 
Gene Names: DBX, DDX3, DDX3X
EC: 3.6.4.13
UniProt & NIH Common Fund Data Resources
Find proteins for O00571 (Homo sapiens)
Explore O00571 
Go to UniProtKB:  O00571
PHAROS:  O00571
GTEx:  ENSG00000215301 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO00571
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.206 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 105.755α = 90
b = 105.755β = 90
c = 152.633γ = 90
Software Package:
Software NamePurpose
SERGUIdata collection
PHASERphasing
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-03-11
    Type: Initial release
  • Version 1.1: 2015-04-29
    Changes: Database references