2ATL

Unmodified Insertion Ternary Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.227 

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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Stepwise Translocation of Dpo4 Polymerase during Error-Free Bypass of an oxoG Lesion

Rechkoblit, O.Malinina, L.Cheng, Y.Kuryavyi, V.Broyde, S.Geacintov, N.E.Patel, D.J.

(2006) PLoS Biol 4: 1-18

  • DOI: 10.1371/journal.pbio.0040011
  • Primary Citation of Related Structures:  
    2ASD, 2ASJ, 2ASL, 2ATL, 2AU0

  • PubMed Abstract: 
  • 7,8-dihydro-8-oxoguanine (oxoG), the predominant lesion formed following oxidative damage of DNA by reactive oxygen species, is processed differently by replicative and bypass polymerases. Our kinetic primer extension studies demonstrate that the bypass polymerase Dpo4 preferentially inserts C opposite oxoG, and also preferentially extends from the oxoG*C base pair, thus achieving error-free bypass of this lesion ...

    7,8-dihydro-8-oxoguanine (oxoG), the predominant lesion formed following oxidative damage of DNA by reactive oxygen species, is processed differently by replicative and bypass polymerases. Our kinetic primer extension studies demonstrate that the bypass polymerase Dpo4 preferentially inserts C opposite oxoG, and also preferentially extends from the oxoG*C base pair, thus achieving error-free bypass of this lesion. We have determined the crystal structures of preinsertion binary, insertion ternary, and postinsertion binary complexes of oxoG-modified template-primer DNA and Dpo4. These structures provide insights into the translocation mechanics of the bypass polymerase during a complete cycle of nucleotide incorporation. Specifically, during noncovalent dCTP insertion opposite oxoG (or G), the little-finger domain-DNA phosphate contacts translocate by one nucleotide step, while the thumb domain-DNA phosphate contacts remain fixed. By contrast, during the nucleotidyl transfer reaction that covalently incorporates C opposite oxoG, the thumb-domain-phosphate contacts are translocated by one nucleotide step, while the little-finger contacts with phosphate groups remain fixed. These stepwise conformational transitions accompanying nucleoside triphosphate binding and covalent nucleobase incorporation during a full replication cycle of Dpo4-catalyzed bypass of the oxoG lesion are distinct from the translocation events in replicative polymerases.


    Organizational Affiliation

    Structural Biology Program, Memorial Sloan-Kettering Cancer Center, New York, New York, USA.



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Dpo4 polymerase IVE [auth A], F [auth B]360Saccharolobus solfataricusMutation(s): 0 
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
Protein Feature View
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  • Reference Sequence
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  • Entity ID: 1
    MoleculeChainsLengthOrganismImage
    5'-D(*GP*GP*TP*TP*GP*GP*AP*TP*GP*GP*TP*AP*(DDG))-3'A [auth D], C [auth H]13N/A
    Protein Feature View
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    • Reference Sequence
    • Find similar nucleic acids by:  Sequence   |   Structure
    • Entity ID: 2
      MoleculeChainsLengthOrganismImage
      5'-D(*CP*T*AP*AP*CP*GP*CP*TP*AP*CP*CP*AP*TP*CP*CP*AP*AP*CP*C)-3'B [auth E], D [auth J]19N/A
      Protein Feature View
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      • Reference Sequence
      Experimental Data & Validation

      Experimental Data

      • Method: X-RAY DIFFRACTION
      • Resolution: 2.80 Å
      • R-Value Free: 0.279 
      • R-Value Work: 0.224 
      • R-Value Observed: 0.227 
      • Space Group: P 1 21 1
      Unit Cell:
      Length ( Å )Angle ( ˚ )
      a = 52.584α = 90
      b = 101.758β = 94.72
      c = 112.286γ = 90
      Software Package:
      Software NamePurpose
      REFMACrefinement
      HKL-2000data reduction
      SCALEPACKdata scaling
      AMoREphasing

      Structure Validation

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      Ligand Structure Quality Assessment  



      Entry History 

      Deposition Data

      Revision History  (Full details and data files)

      • Version 1.0: 2006-01-10
        Type: Initial release
      • Version 1.1: 2008-04-30
        Changes: Version format compliance
      • Version 1.2: 2011-07-13
        Changes: Advisory, Version format compliance