6FWS

Structure of DinG in complex with ssDNA and ADPBeF

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.221 

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Literature

DNA translocation mechanism of an XPD family helicase.

Cheng, K., Wigley, D.B.

(2018) Elife 7

  • DOI: https://doi.org/10.7554/eLife.42400
  • Primary Citation of Related Structures:  
    6FWR, 6FWS

  • PubMed Abstract: 

    • The XPD family of helicases, that includes human disease-related FANCJ, DDX11 and RTEL1, are Superfamily two helicases that contain an iron-sulphur cluster domain, translocate on ssDNA in a 5'-3' direction and play important roles in genome stability. Consequently, mutations in several of these family members in eukaryotes cause human diseases ...

    The XPD family of helicases, that includes human disease-related FANCJ, DDX11 and RTEL1, are Superfamily two helicases that contain an iron-sulphur cluster domain, translocate on ssDNA in a 5'-3' direction and play important roles in genome stability. Consequently, mutations in several of these family members in eukaryotes cause human diseases. Family members in bacteria, such as the DinG helicase from Escherichia coli , are also involved in DNA repair. Here we present crystal structures of complexes of DinG bound to single-stranded DNA (ssDNA) in the presence and absence of an ATP analogue (ADP•BeF 3 ), that suggest a mechanism for 5'-3' translocation along the ssDNA substrate. This proposed mechanism has implications for how those enzymes of the XPD family that recognise bulky DNA lesions might stall at these as the first step in initiating DNA repair. Biochemical data reveal roles for conserved residues that are mutated in human diseases.

    Organizational Affiliation: 

    Section of Structural Biology, Department of Medicine, Imperial College London, London, United Kingdom.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ATP-dependent DNA helicase DinGA,
C [auth B]		716Escherichia coliMutation(s): 0 
Gene Names: dinG, CV83915_00780
EC: 3.6.4.12
UniProt
Find proteins for P27296 (Escherichia coli (strain K12))
Explore P27296 
Go to UniProtKB:  P27296
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP27296
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
DNA (5'-D(*TP*TP*TP*TP*TP*TP*TP*TP*TP*TP*T)-3')B [auth C]11synthetic construct
Protein Feature View
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  • Reference Sequence

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Entity ID: 3
MoleculeChainsLengthOrganismImage
DNA (5'-D(*TP*TP*TP*TP*TP*TP*TP*TP*TP*T)-3')10synthetic construct
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.221 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 109.771α = 90
b = 119.751β = 90
c = 126.74γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
xia2data reduction
xia2data scaling
PHASERphasing

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Medical Research Council (United Kingdom)United KingdomMR/N009258/1

Revision History  (Full details and data files)

  • Version 1.0: 2018-12-19
    Type: Initial release