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 

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

  • 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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SERINE/THREONINE-PROTEIN KINASE CHK2
A
323Homo sapiensMutation(s): 0 
Gene Names: CHEK2 (CDS1, CHK2, RAD53)
EC: 2.7.11.1
Find proteins for O96017 (Homo sapiens)
Go to Gene View: CHEK2
Go to UniProtKB:  O96017
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EDO
Query on EDO

Download SDF File 
Download CCD File 
A
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
D1A
Query on D1A

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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
MG
Query on MG

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Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
NO3
Query on NO3

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Download CCD File 
A
NITRATE ION
N O3
NHNBFGGVMKEFGY-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
D1AIC50: 138 nM BINDINGMOAD
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 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 90.866α = 90.00
b = 90.866β = 90.00
c = 93.340γ = 120.00
Software Package:
Software NamePurpose
HKL-3000data reduction
SCALEPACKdata scaling
REFMACrefinement
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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