3KRR

Crystal Structure of JAK2 complexed with a potent quinoxaline ATP site inhibitor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.167 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Potent and Selective Inhibition of Polycythemia by the Quinoxaline JAK2 Inhibitor NVP-BSK805

Baffert, F.Regnier, C.H.De Pover, A.Pissot-Soldermann, C.Tavares, G.A.Blasco, F.Brueggen, J.Chene, P.Drueckes, P.Erdmann, D.Furet, P.Gerspacher, M.Lang, M.Ledieu, D.Nolan, L.Ruetz, S.Trappe, J.Vangrevelinghe, E.Wartmann, M.Wyder, L.Hofmann, F.Radimerski, T.

(2010) Mol.Cancer Ther. 9: 1945-1955

  • DOI: 10.1158/1535-7163.MCT-10-0053

  • PubMed Abstract: 
  • The recent discovery of an acquired activating point mutation in JAK2, substituting valine at amino acid position 617 for phenylalanine, has greatly improved our understanding of the molecular mechanism underlying chronic myeloproliferative neoplasms ...

    The recent discovery of an acquired activating point mutation in JAK2, substituting valine at amino acid position 617 for phenylalanine, has greatly improved our understanding of the molecular mechanism underlying chronic myeloproliferative neoplasms. Strikingly, the JAK2(V617F) mutation is found in nearly all patients suffering from polycythemia vera and in roughly every second patient suffering from essential thrombocythemia and primary myelofibrosis. Thus, JAK2 represents a promising target for the treatment of myeloproliferative neoplasms and considerable efforts are ongoing to discover and develop inhibitors of the kinase. Here, we report potent inhibition of JAK2(V617F) and JAK2 wild-type enzymes by a novel substituted quinoxaline, NVP-BSK805, which acts in an ATP-competitive manner. Within the JAK family, NVP-BSK805 displays more than 20-fold selectivity towards JAK2 in vitro, as well as excellent selectivity in broader kinase profiling. The compound blunts constitutive STAT5 phosphorylation in JAK2(V617F)-bearing cells, with concomitant suppression of cell proliferation and induction of apoptosis. In vivo, NVP-BSK805 exhibited good oral bioavailability and a long half-life. The inhibitor was efficacious in suppressing leukemic cell spreading and splenomegaly in a Ba/F3 JAK2(V617F) cell-driven mouse mechanistic model. Furthermore, NVP-BSK805 potently suppressed recombinant human erythropoietin-induced polycythemia and extramedullary erythropoiesis in mice and rats.


    Organizational Affiliation

    Disease Area Oncology, Novartis Institutes for BioMedical Research, 4057 Basel, Switzerland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Tyrosine-protein kinase JAK2
A
295Homo sapiensMutation(s): 0 
Gene Names: JAK2
EC: 2.7.10.2
Find proteins for O60674 (Homo sapiens)
Go to Gene View: JAK2
Go to UniProtKB:  O60674
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
DQX
Query on DQX

Download SDF File 
Download CCD File 
A
8-[3,5-difluoro-4-(morpholin-4-ylmethyl)phenyl]-2-(1-piperidin-4-yl-1H-pyrazol-4-yl)quinoxaline
C27 H28 F2 N6 O
IBPVXAOOVUAOKJ-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
PTR
Query on PTR
A
L-PEPTIDE LINKINGC9 H12 N O6 PTYR
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
DQXIC50: 7.3 nM (100) BINDINGDB
DQXIC50: 0.48 nM BINDINGMOAD
DQXIC50: 0.48 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.167 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 93.312α = 90.00
b = 103.009β = 90.00
c = 68.739γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling
CCP4model building
CCP4phasing
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-07-21
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance