2W7P

Structure and Activity of Bypass Synthesis by Human DNA Polymerase Kappa Opposite the 7,8-Dihydro-8-oxodeoxyguanosine Adduct

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.71 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.236 

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Literature

Structural and Functional Elucidation of the Mechanism Promoting Error-Prone Synthesis by Human DNA Polymerase Kappa Opposite the 7,8-Dihydro-8-Oxo-2'-Deoxyguanosine Adduct.

Irimia, A., Eoff, R.L., Guengerich, F.P., Egli, M.

(2009) J Biol Chem 284: 22467

  • DOI: 10.1074/jbc.M109.003905
  • Primary Citation of Related Structures:  
    2W7O, 2W7P

  • PubMed Abstract: 

    • Human polymerase kappa (hPol kappa) is one of four eukaryotic Y-class DNA polymerases and may be an important element in the cellular response to polycyclic aromatic hydrocarbons such as benzo[a]pyrene, which can lead to reactive oxygenated metabolite-mediated oxidative stress ...

    Human polymerase kappa (hPol kappa) is one of four eukaryotic Y-class DNA polymerases and may be an important element in the cellular response to polycyclic aromatic hydrocarbons such as benzo[a]pyrene, which can lead to reactive oxygenated metabolite-mediated oxidative stress. Here, we present a detailed analysis of the activity and specificity of hPol kappa bypass opposite the major oxidative adduct 7,8-dihydro-8-oxo-2'-deoxyguanosine (8-oxoG). Unlike its archaeal homolog Dpo4, hPol kappa bypasses this lesion in an error-prone fashion by inserting mainly dATP. Analysis of transient-state kinetics shows diminished "bursts" for dATP:8-oxoG and dCTP:8-oxoG incorporation, indicative of non-productive complex formation, but dATP:8-oxoG insertion events that do occur are 2-fold more efficient than dCTP:G insertion events. Crystal structures of ternary hPol kappa complexes with adducted template-primer DNA reveal non-productive (dGTP and dATP) alignments of incoming nucleotide and 8-oxoG. Structural limitations placed upon the hPol kappa by interactions between the N-clasp and finger domains combined with stabilization of the syn-oriented template 8-oxoG through the side chain of Met-135 both appear to contribute to error-prone bypass. Mutating Leu-508 in the little finger domain of hPol kappa to lysine modulates the insertion opposite 8-oxoG toward more accurate bypass, similar to previous findings with Dpo4. Our structural and activity data provide insight into important mechanistic aspects of error-prone bypass of 8-oxoG by hPol kappa compared with accurate and efficient bypass of the lesion by Dpo4 and polymerase eta.

    Organizational Affiliation: 

    Department of Biochemistry and Center in Molecular Toxicology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146, USA.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA POLYMERASE KAPPAA, B508Homo sapiensMutation(s): 0 
Gene Names: POLK, DINB1
EC: 2.7.7.7
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UBT6 (Homo sapiens)
Explore Q9UBT6 
Go to UniProtKB:  Q9UBT6
PHAROS:  Q9UBT6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9UBT6
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
5'-D(*GP*GP*GP*GP*GP*AP*AP*GP*GP*AP*TP*TP*C)-3'C [auth E],
E [auth P]		13N/A
Protein Feature View
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  • Reference Sequence

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Entity ID: 3
MoleculeChainsLengthOrganismImage
5'-D(TP*CP*AP*CP*8OGP*GP*AP*AP*TP*CP*CP*TP* TP*CP*CP*CP*CP*C)-3'D [auth F],
F [auth T]		18N/A
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.71 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.236 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 167.829α = 90
b = 220.847β = 90
c = 119.208γ = 90
Software Package:
Software NamePurpose
CNSrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2008-12-23 
  • Released Date: 2009-06-16 
    • Deposition Author(s): Irimia, A., Egli, M.

Revision History  (Full details and data files)

  • Version 1.0: 2009-06-16
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance