4O3S

Crystal structure of human polymerase eta extending an 8-oxog dna lesion: post insertion of 8-oxog-dc pair


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.72 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.174 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Kinetics, Structure, and Mechanism of 8-Oxo-7,8-dihydro-2'-deoxyguanosine Bypass by Human DNA Polymerase eta

Patra, A.Nagy, L.D.Zhang, Q.Su, Y.Muller, L.Guengerich, F.P.Egli, M.

(2014) J Biol Chem 289: 16867-16882

  • DOI: 10.1074/jbc.M114.551820
  • Primary Citation of Related Structures:  
    4O3P, 4O3Q, 4O3R, 4O3S, 4O3N, 4O3O

  • PubMed Abstract: 
  • DNA damage incurred by a multitude of endogenous and exogenous factors constitutes an inevitable challenge for the replication machinery. Cells rely on various mechanisms to either remove lesions or bypass them in a more or less error-prone fashion. The latter pathway involves the Y-family polymerases that catalyze trans-lesion synthesis across sites of damaged DNA ...

    DNA damage incurred by a multitude of endogenous and exogenous factors constitutes an inevitable challenge for the replication machinery. Cells rely on various mechanisms to either remove lesions or bypass them in a more or less error-prone fashion. The latter pathway involves the Y-family polymerases that catalyze trans-lesion synthesis across sites of damaged DNA. 7,8-Dihydro-8-oxo-2'-deoxyguanosine (8-oxoG) is a major lesion that is a consequence of oxidative stress and is associated with cancer, aging, hepatitis, and infertility. We have used steady-state and transient-state kinetics in conjunction with mass spectrometry to analyze in vitro bypass of 8-oxoG by human DNA polymerase η (hpol η). Unlike the high fidelity polymerases that show preferential insertion of A opposite 8-oxoG, hpol η is capable of bypassing 8-oxoG in a mostly error-free fashion, thus preventing GC→AT transversion mutations. Crystal structures of ternary hpol η-DNA complexes and incoming dCTP, dATP, or dGTP opposite 8-oxoG reveal that an arginine from the finger domain assumes a key role in avoiding formation of the nascent 8-oxoG:A pair. That hpol η discriminates against dATP exclusively at the insertion stage is confirmed by structures of ternary complexes that allow visualization of the extension step. These structures with G:dCTP following either 8-oxoG:C or 8-oxoG:A pairs exhibit virtually identical active site conformations. Our combined data provide a detailed understanding of hpol η bypass of the most common oxidative DNA lesion.


    Organizational Affiliation

    From the Department of Biochemistry and Center in Molecular Toxicology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232 and martin.egli@vanderbilt.edu.



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA polymerase eta A432Homo sapiensMutation(s): 0 
Gene Names: POLHRAD30RAD30AXPV
EC: 2.7.7.7
Find proteins for Q9Y253 (Homo sapiens)
Explore Q9Y253 
Go to UniProtKB:  Q9Y253
NIH Common Fund Data Resources
PHAROS:  Q9Y253
Protein Feature View
Expand
  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
  • Entity ID: 2
    MoleculeChainsLengthOrganismImage
    DNA (5'-D(*CP*AP*TP*GP*(8OG)P*TP*GP*AP*CP*GP*CP*T)-3')T12N/A
    • Find similar nucleic acids by:  Sequence   |   Structure
    • Entity ID: 3
      MoleculeChainsLengthOrganismImage
      DNA (5'-D(*AP*GP*CP*GP*TP*CP*AP*C)-3')P8N/A
      Small Molecules
      Ligands 3 Unique
      IDChainsName / Formula / InChI Key2D Diagram3D Interactions
      0KX
      Query on 0KX

      Download Ideal Coordinates CCD File 
      A
      2'-deoxy-5'-O-[(R)-hydroxy{[(R)-hydroxy(phosphonooxy)phosphoryl]amino}phosphoryl]cytidine
      C9 H17 N4 O12 P3
      STYMTWKSQLVXJN-SHYZEUOFSA-N
       Ligand Interaction
      GOL
      Query on GOL

      Download Ideal Coordinates CCD File 
      A
      GLYCEROL
      C3 H8 O3
      PEDCQBHIVMGVHV-UHFFFAOYSA-N
       Ligand Interaction
      MG
      Query on MG

      Download Ideal Coordinates CCD File 
      A
      MAGNESIUM ION
      Mg
      JLVVSXFLKOJNIY-UHFFFAOYSA-N
       Ligand Interaction
      Experimental Data & Validation

      Experimental Data

      • Method: X-RAY DIFFRACTION
      • Resolution: 1.72 Å
      • R-Value Free: 0.210 
      • R-Value Work: 0.172 
      • R-Value Observed: 0.174 
      • Space Group: P 61
      Unit Cell:
      Length ( Å )Angle ( ˚ )
      a = 98.312α = 90
      b = 98.312β = 90
      c = 81.596γ = 120
      Software Package:
      Software NamePurpose
      MD2data collection
      PHASERphasing
      PHENIXrefinement
      HKL-2000data reduction
      HKL-2000data scaling

      Structure Validation

      View Full Validation Report



      Entry History 

      Deposition Data

      • Deposited Date: 2013-12-18 
      • Released Date: 2014-04-30 
      • Deposition Author(s): Patra, A., Egli, M.

      Revision History  (Full details and data files)

      • Version 1.0: 2014-04-30
        Type: Initial release
      • Version 1.1: 2014-07-02
        Changes: Database references