3M9M

Crystal Structure of Dpo4 in complex with DNA containing the major cisplatin lesion

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.309 
  • R-Value Work: 0.285 
  • R-Value Observed: 0.286 

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Literature

Structural insight into dynamic bypass of the major cisplatin-DNA adduct by Y-family polymerase Dpo4.

Wong, J.H., Brown, J.A., Suo, Z., Blum, P., Nohmi, T., Ling, H.

(2010) EMBO J 29: 2059-2069

  • DOI: 10.1038/emboj.2010.101
  • Primary Citation of Related Structures:  
    3M9M, 3M9N, 3M9O

  • PubMed Abstract: 

    • Y-family DNA polymerases bypass Pt-GG, the cisplatin-DNA double-base lesion, contributing to the cisplatin resistance in tumour cells. To reveal the mechanism, we determined three structures of the Y-family DNA polymerase, Dpo4, in complex with Pt-GG DNA ...

    Y-family DNA polymerases bypass Pt-GG, the cisplatin-DNA double-base lesion, contributing to the cisplatin resistance in tumour cells. To reveal the mechanism, we determined three structures of the Y-family DNA polymerase, Dpo4, in complex with Pt-GG DNA. The crystallographic snapshots show three stages of lesion bypass: the nucleotide insertions opposite the 3'G (first insertion) and 5'G (second insertion) of Pt-GG, and the primer extension beyond the lesion site. We observed a dynamic process, in which the lesion was converted from an open and angular conformation at the first insertion to a depressed and nearly parallel conformation at the subsequent reaction stages to fit into the active site of Dpo4. The DNA translocation-coupled conformational change may account for additional inhibition on the second insertion reaction. The structures illustrate that Pt-GG disturbs the replicating base pair in the active site, which reduces the catalytic efficiency and fidelity. The in vivo relevance of Dpo4-mediated Pt-GG bypass was addressed by a dpo-4 knockout strain of Sulfolobus solfataricus, which exhibits enhanced sensitivity to cisplatin and proteomic alterations consistent with genomic stress.

    Organizational Affiliation: 

    Department of Biochemistry, University of Western Ontario, London, Ontario, Canada.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA polymerase IVA [auth B]352Saccharolobus solfataricusMutation(s): 0 
Gene Names: dbh, dpo4, SSO2448
EC: 2.7.7.7
UniProt
Find proteins for Q97W02 (Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2))
Explore Q97W02 
Go to UniProtKB:  Q97W02
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ97W02
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
DNA (5'-D(*GP*GP*GP*GP*GP*AP*AP*GP*GP*AP*AP*AP*G)-3')B [auth P]13N/A
Protein Feature View
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  • Reference Sequence

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Entity ID: 3
MoleculeChainsLengthOrganismImage
DNA (5'-D(*TP*CP*TP*GP*GP*CP*TP*TP*TP*CP*CP*TP*TP*CP*CP*CP*CP*C)-3')C [auth T]18N/A
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.309 
  • R-Value Work: 0.285 
  • R-Value Observed: 0.286 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 98.576α = 90
b = 101.193β = 90
c = 52.418γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement
PDB_EXTRACTdata extraction
HKL-2000data collection
CNSphasing

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2010-03-22 
  • Released Date: 2010-06-16 
    • Deposition Author(s): Wong, J.H.Y., Ling, H.

Revision History  (Full details and data files)

  • Version 1.0: 2010-06-16
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-11-08
    Changes: Refinement description