2B7A

The structural basis of Janus Kinase 2 inhibition by a potent and specific pan-Janus kinase inhibitor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.211 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

The structural basis of Janus kinase 2 inhibition by a potent and specific pan-Janus kinase inhibitor.

Lucet, I.S.Fantino, E.Styles, M.Bamert, R.Patel, O.Broughton, S.E.Walter, M.Burns, C.J.Treutlein, H.Wilks, A.F.Rossjohn, J.

(2006) Blood 107: 176-183

  • DOI: 10.1182/blood-2005-06-2413
  • Primary Citation of Related Structures:  
    2B7A

  • PubMed Abstract: 
  • JAK2, a member of the Janus kinase (JAK) family of protein tyrosine kinases (PTKs), is an important intracellular mediator of cytokine signaling. Mutations of the JAK2 gene are associated with hematologic cancers, and aberrant JAK activity is also associated with a number of immune diseases, including rheumatoid arthritis ...

    JAK2, a member of the Janus kinase (JAK) family of protein tyrosine kinases (PTKs), is an important intracellular mediator of cytokine signaling. Mutations of the JAK2 gene are associated with hematologic cancers, and aberrant JAK activity is also associated with a number of immune diseases, including rheumatoid arthritis. Accordingly, the development of JAK2-specific inhibitors has tremendous clinical relevance. Critical to the function of JAK2 is its PTK domain. We report the 2.0 A crystal structure of the active conformation of the JAK2 PTK domain in complex with a high-affinity, pan-JAK inhibitor that appears to bind via an induced fit mechanism. This inhibitor, the tetracyclic pyridone 2-tert-butyl-9-fluoro-3,6-dihydro-7H-benz[h]-imidaz[4,5-f]isoquinoline-7-1, was buried deep within a constricted ATP-binding site, in which extensive interactions, including residues that are unique to JAK2 and the JAK family, are made with the inhibitor. We present a structural basis of high-affinity JAK-specific inhibition that will undoubtedly provide an invaluable tool for the further design of novel, potent, and specific therapeutics against the JAK family.


    Organizational Affiliation

    Protein Crystallography Unit, Department of Biochemistry and Molecular Biology, School of Biomedical Sciences, Monash University, Clayton, Victoria 3800, Australia.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Tyrosine-protein kinase JAK2A, B293Homo sapiensMutation(s): 3 
Gene Names: JAK2
EC: 2.7.1.112 (PDB Primary Data), 2.7.10.2 (UniProt)
Find proteins for O60674 (Homo sapiens)
Explore O60674 
Go to UniProtKB:  O60674
NIH Common Fund Data Resources
PHAROS:  O60674
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
IZA
Query on IZA

Download Ideal Coordinates CCD File 
C [auth A], D [auth B]2-TERT-BUTYL-9-FLUORO-3,6-DIHYDRO-7H-BENZ[H]-IMIDAZ[4,5-F]ISOQUINOLINE-7-ONE
C18 H16 F N3 O
VNDWQCSOSCCWIP-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
PTR
Query on PTR
A, BL-PEPTIDE LINKINGC9 H12 N O6 PTYR
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
IZAIC50:  1   nM  BindingDB
IZAIC50:  1   nM  Binding MOAD
IZAIC50 :  1   nM  PDBBind
IZAIC50:  1400   nM  BindingDB
IZAIC50:  4.5   nM  BindingDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.211 
  • Space Group: P 41
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 111.273α = 90
b = 111.273β = 90
c = 70.577γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
SCALEPACKdata scaling
AMoREphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-01-10
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description