1MQ3

Human DNA Polymerase Beta Complexed With Gapped DNA Containing an 8-oxo-7,8-dihydro-Guanine Template Paired with dCTP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.235 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of DNA Polymerase beta with the Mutagenic DNA Lesion 8-oxodeoxyguanine Reveals Structural Insights into its Coding Potential

Krahn, J.M.Beard, W.A.Miller, H.Grollman, A.P.Wilson, S.H.

(2003) Structure 11: 121-127

  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Oxidative damage to DNA generates 8-oxo-7,8-dihydro-2'-deoxyguanosine (8-oxodG). During DNA replication and repair synthesis, 8-oxodG can pair with cytosine or adenine. The ability to accurately replicate through this lesion depends on the DNA polyme ...

    Oxidative damage to DNA generates 8-oxo-7,8-dihydro-2'-deoxyguanosine (8-oxodG). During DNA replication and repair synthesis, 8-oxodG can pair with cytosine or adenine. The ability to accurately replicate through this lesion depends on the DNA polymerase. We report the first structure of a polymerase with a promutagenic DNA lesion, 8-oxodG, in the confines of its active site. The modified guanine residue is in an anti conformation and forms Watson-Crick hydrogen bonds with an incoming dCTP. To accommodate the oxygen at C8, the 5'-phosphate backbone of the templating nucleotide flips 180 degrees. Thus, the flexibility of the template sugar-phosphate backbone near the polymerase active site is one parameter that influences the anti-syn equilibrium of 8-oxodG. Our results provide insights into the mechanisms employed by polymerases to select the complementary dNTP.


    Organizational Affiliation

    Laboratory of Structural Biology, National Institute of Environmental Health Sciences, NIH, P.O. Box 12233, Research Triangle Park, NC 27709, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
DNA POLYMERASE BETA
A
335Homo sapiensGene Names: POLB
EC: 2.7.7.7, 4.2.99.-
Find proteins for P06746 (Homo sapiens)
Go to Gene View: POLB
Go to UniProtKB:  P06746
Entity ID: 1
MoleculeChainsLengthOrganism
5'-D(*CP*CP*GP*AP*CP*(8OG)P*GP*CP*GP*CP*AP*TP*CP*AP*GP*C)-3'T16N/A
Entity ID: 2
MoleculeChainsLengthOrganism
5'-D(*GP*CP*TP*GP*AP*TP*GP*CP*GP*(DOC))-3'P10N/A
Entity ID: 3
MoleculeChainsLengthOrganism
5'-D(P*GP*TP*CP*GP*G)-3'D5N/A
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

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A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
DCP
Query on DCP

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Download CCD File 
A
2'-DEOXYCYTIDINE-5'-TRIPHOSPHATE
C9 H16 N3 O13 P3
RGWHQCVHVJXOKC-SHYZEUOFSA-N
 Ligand Interaction
MG
Query on MG

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Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
8OG
Query on 8OG
T
DNA LINKINGC10 H14 N5 O8 PDG
DOC
Query on DOC
P
DNA LINKINGC9 H14 N3 O6 PDC
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.235 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 50.500α = 90.00
b = 79.900β = 107.90
c = 55.600γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
CNSphasing
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-01-28
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance