3KB7

Crystal structure of Polo-like kinase 1 in complex with a pyrazoloquinazoline inhibitor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.303 
  • R-Value Work: 0.208 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Identification of 4,5-dihydro-1H-pyrazolo[4,3-h]quinazoline derivatives as a new class of orally and selective Polo-like kinase 1 inhibitors

Beria, I.Ballinari, D.Bertrand, J.A.Borghi, D.Bossi, R.T.Brasca, M.G.Cappella, P.Caruso, M.Ceccarelli, W.Ciavolella, A.Cristiani, C.Croci, V.De Ponti, A.Fachin, G.Ferguson, R.D.Lansen, J.Moll, J.K.Pesenti, E.Posteri, H.Perego, R.Rocchetti, M.Storici, P.Volpi, D.Valsasina, B.

(2010) J.Med.Chem. 53: 3532-3551

  • DOI: 10.1021/jm901713n

  • PubMed Abstract: 
  • Polo-like kinase 1 (Plk1) is a fundamental regulator of mitotic progression whose overexpression is often associated with oncogenesis and therefore is recognized as an attractive therapeutic target in the treatment of proliferative diseases. Here we ...

    Polo-like kinase 1 (Plk1) is a fundamental regulator of mitotic progression whose overexpression is often associated with oncogenesis and therefore is recognized as an attractive therapeutic target in the treatment of proliferative diseases. Here we discuss the structure-activity relationship of the 4,5-dihydro-1H-pyrazolo[4,3-h]quinazoline class of compounds that emerged from a high throughput screening (HTS) campaign as potent inhibitors of Plk1 kinase. Furthermore, we describe the discovery of 49, 8-{[2-methoxy-5-(4-methylpiperazin-1-yl)phenyl]amino}-1-methyl-4,5-dihydro-1H-pyrazolo[4,3-h]quinazoline-3-carboxamide, as a highly potent and specific ATP mimetic inhibitor of Plk1 (IC(50) = 0.007 microM) as well as its crystal structure in complex with the methylated Plk1(36-345) construct. Compound 49 was active in cell proliferation against different tumor cell lines with IC(50) values in the submicromolar range and active in vivo in the HCT116 xenograft model where it showed 82% tumor growth inhibition after repeated oral administration.


    Organizational Affiliation

    Nerviano Medical Sciences Srl, Oncology, Viale Pasteur 10, 20014 Nerviano, (Mi), Italy. italo.beria@nervianoms.com




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Serine/threonine-protein kinase PLK1
A
311Homo sapiensMutation(s): 0 
Gene Names: PLK1 (PLK)
EC: 2.7.11.21
Find proteins for P53350 (Homo sapiens)
Go to Gene View: PLK1
Go to UniProtKB:  P53350
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
071
Query on 071

Download SDF File 
Download CCD File 
A
8-{[2-methoxy-5-(4-methylpiperazin-1-yl)phenyl]amino}-1-methyl-4,5-dihydro-1H-pyrazolo[4,3-h]quinazoline-3-carboxamide
C23 H28 N8 O2
SWTRIZHCIUWGAU-UHFFFAOYSA-N
 Ligand Interaction
TLA
Query on TLA

Download SDF File 
Download CCD File 
A
L(+)-TARTARIC ACID
C4 H6 O6
FEWJPZIEWOKRBE-JCYAYHJZSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
NMM
Query on NMM
A
L-PEPTIDE LINKINGC7 H16 N4 O2ARG
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
071IC50: 7 - 10 nM (100) BINDINGDB
071IC50: 7 nM BINDINGMOAD
71IC50: 7 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.303 
  • R-Value Work: 0.208 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 67.352α = 90.00
b = 67.352β = 90.00
c = 154.109γ = 120.00
Software Package:
Software NamePurpose
SCALAdata scaling
REFMACrefinement
MOLREPphasing
DNAdata collection
MOSFLMdata reduction
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-05-19
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance