5T14

DNA polymerase kappa extending beyond a bulky major benzo[a]pyrene adduct


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.204 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural basis of accurate replication beyond a bulky major benzo[a]pyrene adduct by human DNA polymerase kappa.

Jha, V.Ling, H.

(2017) DNA Repair (Amst.) 49: 43-50

  • DOI: 10.1016/j.dnarep.2016.11.001

  • PubMed Abstract: 
  • Human Y-family DNA polymerase kappa (polκ) is specialized to bypass bulky lesions in DNA in an error-free way, thus protecting cells from carcinogenic bulky DNA adducts. Benzo[a]pyrene (BP) is one of the most ubiquitous polycyclic aromatic hydrocarbo ...

    Human Y-family DNA polymerase kappa (polκ) is specialized to bypass bulky lesions in DNA in an error-free way, thus protecting cells from carcinogenic bulky DNA adducts. Benzo[a]pyrene (BP) is one of the most ubiquitous polycyclic aromatic hydrocarbons and an environmental carcinogen. BP covalently modifies DNA and generates mutagenic, bulky adducts. The major BP adduct formed in cells is 10S (+)-trans-anti-BP-N2-dG adduct (BP-dG), which is associated with cancer. The molecular mechanism of how polκ replicates BP-dG accurately is not clear. Here we report the structure of polκ captured at the lesion-extension stage: the enzyme is extending the primer strand after the base pair containing the BP-dG adduct in the template strand at the -1 position. Polκ accommodates the BP adduct in the nascent DNA's minor groove and keeps the adducted DNA helix in a B-form. Two water molecules cover the edge of the minor groove of the replicating base pair (0 position), which is secured by the BP ring in the -1 position in a 5' orientation. The 5' oriented BP adduct keeps correct Watson-Crick base pairing in the active site and promotes high fidelity replication. Our structural and biochemical data reveal a unique molecular basis for accurate DNA replication right after the bulky lesion BP-dG.


    Organizational Affiliation

    Department of Biochemistry, Schulich School of Medicine & Dentistry, University of Western Ontario, London, Ontario, N6A 5C1, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNA polymerase kappa
A, B
527Homo sapiensGene Names: POLK (DINB1)
EC: 2.7.7.7
Find proteins for Q9UBT6 (Homo sapiens)
Go to Gene View: POLK
Go to UniProtKB:  Q9UBT6
Entity ID: 2
MoleculeChainsLengthOrganism
DNAC,P9unidentified
Entity ID: 3
MoleculeChainsLengthOrganism
DNAD,T13unidentified
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

Download SDF File 
Download CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
PGE
Query on PGE

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Download CCD File 
B
TRIETHYLENE GLYCOL
C6 H14 O4
ZIBGPFATKBEMQZ-UHFFFAOYSA-N
 Ligand Interaction
DZ4
Query on DZ4

Download SDF File 
Download CCD File 
A, B
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
VKJ
Query on VKJ
D, T
NON-POLYMERC30 H28 N5 O10 P

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.204 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 65.250α = 90.00
b = 128.820β = 90.00
c = 167.460γ = 90.00
Software Package:
Software NamePurpose
iMOSFLMdata reduction
REFMACrefinement
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2016-08-17 
  • Released Date: 2016-12-21 
  • Deposition Author(s): Jha, V.K., Ling, H.

Funding OrganizationCountryGrant Number
Canadian Institutes of Health ResearchCanadaMOP-67128

Revision History 

  • Version 1.0: 2016-12-21
    Type: Initial release
  • Version 1.1: 2017-01-18
    Type: Database references