2W7X

Cellular inhibition of checkpoint kinase 2 and potentiation of cytotoxic drugs by novel Chk2 inhibitor PV1019


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.07 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.195 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Cellular Inhibition of Chk2 Kinase and Potentiation of Camptothecins and Radiation by the Novel Chk2 Inhibitor Pv1019.

Jobson, A.G.Lountos, G.T.Lorenzi, P.L.Llamas, J.Connelly, J.Cerna, D.Tropea, J.E.Onda, A.Zoppoli, G.Kondapaka, S.Zhang, G.Caplen, N.J.Cardellina, J.H.Yoo, S.S.Monks, A.Self, C.Waugh, D.S.Shoemaker, R.H.Pommier, Y.

(2009) J Pharmacol Exp Ther 331: 816

  • DOI: 10.1124/jpet.109.154997
  • Primary Citation of Related Structures:  
    2W7X

  • PubMed Abstract: 
  • Chk2 is a checkpoint kinase involved in the ataxia telangiectasia mutated pathway, which is activated by genomic instability and DNA damage, leading to either cell death (apoptosis) or cell cycle arrest. Chk2 provides an unexplored therapeutic target ...

    Chk2 is a checkpoint kinase involved in the ataxia telangiectasia mutated pathway, which is activated by genomic instability and DNA damage, leading to either cell death (apoptosis) or cell cycle arrest. Chk2 provides an unexplored therapeutic target against cancer cells. We recently reported 4,4'-diacetyldiphenylurea-bis(guanylhydrazone) (NSC 109555) as a novel chemotype Chk2 inhibitor. We have now synthesized a derivative of NSC 109555, PV1019 (NSC 744039) [7-nitro-1H-indole-2-carboxylic acid {4-[1-(guanidinohydrazone)-ethyl]-phenyl}-amide], which is a selective submicromolar inhibitor of Chk2 in vitro. The cocrystal structure of PV1019 bound in the ATP binding pocket of Chk2 confirmed enzymatic/biochemical observations that PV1019 acts as a competitive inhibitor of Chk2 with respect to ATP. PV1019 was found to inhibit Chk2 in cells. It inhibits Chk2 autophosphorylation (which represents the cellular kinase activation of Chk2), Cdc25C phosphorylation, and HDMX degradation in response to DNA damage. PV1019 also protects normal mouse thymocytes against ionizing radiation-induced apoptosis, and it shows synergistic antiproliferative activity with topotecan, camptothecin, and radiation in human tumor cell lines. We also show that PV1019 and Chk2 small interfering RNAs can exert antiproliferative activity themselves in the cancer cells with high Chk2 expression in the NCI-60 screen. These data indicate that PV1019 is a potent and selective inhibitor of Chk2 with chemotherapeutic and radiosensitization potential.


    Organizational Affiliation

    Laboratory of Molecular Pharmacology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892-4255, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
SERINE/THREONINE-PROTEIN KINASE CHK2A323Homo sapiensMutation(s): 0 
Gene Names: CHEK2CDS1CHK2RAD53
EC: 2.7.11.1
Find proteins for O96017 (Homo sapiens)
Explore O96017 
Go to UniProtKB:  O96017
NIH Common Fund Data Resources
PHAROS  O96017
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
D1A
Query on D1A

Download CCD File 
A
N-[4-[(E)-N-carbamimidamido-C-methyl-carbonimidoyl]phenyl]-7-nitro-1H-indole-2-carboxamide
C18 H17 N7 O3
ZKHRFTLMLVMQMS-AUEPDCJTSA-N
 Ligand Interaction
EDO
Query on EDO

Download CCD File 
A
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
NO3
Query on NO3

Download CCD File 
A
NITRATE ION
N O3
NHNBFGGVMKEFGY-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
D1AIC50:  138   nM  Binding MOAD
D1AIC50 :  24   nM  PDBBind
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.07 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.195 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 90.866α = 90
b = 90.866β = 90
c = 93.34γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
HKL-3000data reduction
SCALEPACKdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-09-22
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Refinement description, Version format compliance