6BS1

Crystal Structure of Human DNA polymerase kappa in complex with DNA containing the major cisplatin lesion


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.15 Å
  • R-Value Free: 0.299 
  • R-Value Work: 0.244 
  • R-Value Observed: 0.247 

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

Structural Basis for Human DNA Polymerase Kappa to Bypass Cisplatin Intrastrand Cross-Link (Pt-GG) Lesion as an Efficient and Accurate Extender.

Jha, V.Ling, H.

(2018) J Mol Biol 430: 1577-1589

  • DOI: https://doi.org/10.1016/j.jmb.2018.04.023
  • Primary Citation of Related Structures:  
    6BRX, 6BS1

  • PubMed Abstract: 

    Cisplatin (cis-diamminedichloroplatinum) is a common chemotherapeutic drug that reacts with the N7 atoms of adjacent guanines in DNA to form the Pt-1,2-d(GpG) intrastrand cross-link (Pt-GG), a major product to block DNA replication. Translesion DNA synthesis has been implicated in chemoresistance during cisplatin treatment of cancer due to Pt-GG lesion bypass. Gene knockdown studies in human cells have indicated a role for polκ during translesion synthesis of the Pt-GG lesion. However, the bypass activity of polκ with cisplatin lesions has not been well characterized. In this study, we investigated polκ's ability to bypass Pt-GG lesion in vitro and determined two crystal structures of polκ in complex with Pt-GG DNA. The ternary complex structures represent two consecutive stages of lesion bypass: nucleotide insertion opposite the 5'G (Pt-GG2) and primer extension immediately after the lesion (Pt-GG3). Our biochemical data showed that polκ is very efficient and accurate in extending DNA primers after the first G of the Pt-GG lesion. The structures demonstrate that the efficiency and accuracy is achieved by stably accommodating the bases with the cisplatin adduct in the active site for proper Watson-Crick base pairing with the incoming nucleotide in both the second insertion and post-insertion complexes. Our studies suggest that polκ works as an extender for efficient replication of the Pt-GG lesion in cells. This work holds promise for considering polκ, along with polη, as potential targets for drug design, which together could improve the efficacy of cisplatin treatment for cancer therapy.


  • Organizational Affiliation

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


Macromolecules

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DNA polymerase kappa
A, B
551Homo sapiensMutation(s): 0 
Gene Names: POLKDINB1
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
GTEx:  ENSG00000122008 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9UBT6
Sequence Annotations
Expand
  • Reference Sequence

Find similar nucleic acids by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains LengthOrganismImage
DNA (5'-D(P*AP*TP*AP*CP*AP*TP*AP*CP*C)-3')C,
E [auth P]
9synthetic construct
Sequence Annotations
Expand
  • Reference Sequence

Find similar nucleic acids by:  Sequence   |   3D Structure  

Entity ID: 3
MoleculeChains LengthOrganismImage
DNA (5'-D(*TP*AP*CP*TP*GP*GP*TP*AP*TP*GP*TP*AP*T)-3')D,
F [auth T]
13synthetic construct
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
DZ4
Query on DZ4

Download Ideal Coordinates CCD File 
O [auth A],
V [auth B]
2'-deoxy-5'-O-[(R)-hydroxy{[(R)-hydroxy(phosphonooxy)phosphoryl]amino}phosphoryl]adenosine
C10 H17 N6 O11 P3
WKIPJDSLGCBQCU-RRKCRQDMSA-N
CPT
Query on CPT

Download Ideal Coordinates CCD File 
X [auth D],
Y [auth T]
Cisplatin
Cl2 H6 N2 Pt
LXZZYRPGZAFOLE-UHFFFAOYSA-L
IOD
Query on IOD

Download Ideal Coordinates CCD File 
J [auth A]
K [auth A]
L [auth A]
M [auth A]
N [auth A]
J [auth A],
K [auth A],
L [auth A],
M [auth A],
N [auth A],
R [auth B],
S [auth B],
T [auth B],
U [auth B]
IODIDE ION
I
XMBWDFGMSWQBCA-UHFFFAOYSA-M
MG
Query on MG

Download Ideal Coordinates CCD File 
G [auth A]
H [auth A]
I [auth A]
P [auth B]
Q [auth B]
G [auth A],
H [auth A],
I [auth A],
P [auth B],
Q [auth B],
W [auth B]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.15 Å
  • R-Value Free: 0.299 
  • R-Value Work: 0.244 
  • R-Value Observed: 0.247 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.8α = 90
b = 127.72β = 90
c = 168.14γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
iMOSFLMdata reduction
SCALAdata scaling
REFMACphasing

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Canadian Institutes of Health Research (CIHR)CanadaMOP-94590

Revision History  (Full details and data files)

  • Version 1.0: 2018-08-22
    Type: Initial release
  • Version 1.1: 2020-01-08
    Changes: Advisory, Author supporting evidence
  • Version 1.2: 2022-04-27
    Changes: Advisory, Database references, Derived calculations
  • Version 1.3: 2024-05-22
    Changes: Data collection, Refinement description