4O3O

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.698 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.172 

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:  

  • 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. ...

    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: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNA polymerase eta
A
435Homo sapiensMutation(s): 0 
Gene Names: POLH (RAD30, RAD30A, XPV)
EC: 2.7.7.7
Find proteins for Q9Y253 (Homo sapiens)
Go to Gene View: POLH
Go to UniProtKB:  Q9Y253
Entity ID: 2
MoleculeChainsLengthOrganism
DNA (5'-D(*CP*AP*TP*(8OG)P*AP*TP*GP*AP*CP*GP*CP*T)-3')T12N/A
Entity ID: 3
MoleculeChainsLengthOrganism
DNA (5'-D(*AP*GP*CP*GP*TP*CP*AP*T)-3')P8N/A
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download SDF File 
Download CCD File 
A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

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Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
DZ4
Query on DZ4

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Download CCD File 
A
2'-deoxy-5'-O-[(R)-hydroxy{[(R)-hydroxy(phosphonooxy)phosphoryl]amino}phosphoryl]adenosine
C10 H17 N6 O11 P3
WKIPJDSLGCBQCU-RRKCRQDMSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
8OG
Query on 8OG
T
DNA LINKINGC10 H14 N5 O8 PDG
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.698 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.172 
  • Space Group: P 61
Unit Cell:
Length (Å)Angle (°)
a = 98.567α = 90.00
b = 98.567β = 90.00
c = 81.555γ = 120.00
Software Package:
Software NamePurpose
PHENIXrefinement
MD2data collection
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

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

Revision History 

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