4O3P

Crystal structure of human polymerase eta inserting dctp opposite an 8-oxog containing dna template


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.72 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.163 
  • R-Value Observed: 0.165 

Starting Model: experimental
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This is version 1.2 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: https://doi.org/10.1074/jbc.M114.551820
  • Primary Citation of Related Structures:  
    4O3N, 4O3O, 4O3P, 4O3Q, 4O3R, 4O3S

  • 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. 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.


Macromolecules

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DNA polymerase eta435Homo sapiensMutation(s): 0 
Gene Names: POLHRAD30RAD30AXPV
EC: 2.7.7.7
UniProt & NIH Common Fund Data Resources
Find proteins for Q9Y253 (Homo sapiens)
Explore Q9Y253 
Go to UniProtKB:  Q9Y253
PHAROS:  Q9Y253
GTEx:  ENSG00000170734 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9Y253
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains LengthOrganismImage
DNA (5'-D(*CP*AP*TP*(8OG)P*AP*TP*GP*AP*CP*GP*CP*T)-3')B [auth T]12N/A
Sequence Annotations
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  • Reference Sequence

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Entity ID: 3
MoleculeChains LengthOrganismImage
DNA (5'-D(*AP*GP*CP*GP*TP*CP*AP*T)-3')C [auth P]8N/A
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.72 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.163 
  • R-Value Observed: 0.165 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 98.198α = 90
b = 98.198β = 90
c = 81.551γ = 120
Software Package:
Software NamePurpose
MD2data collection
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

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
  • Version 1.2: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description