4PUZ

Crystal structure of spleen tyrosine kinase (Syk) in complex with GS-9973


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.085 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.209 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Discovery of GS-9973, a Selective and Orally Efficacious Inhibitor of Spleen Tyrosine Kinase.

Currie, K.S.Kropf, J.E.Lee, T.Blomgren, P.Xu, J.Zhao, Z.Gallion, S.Whitney, J.A.Maclin, D.Lansdon, E.B.Maciejewski, P.Rossi, A.M.Rong, H.Macaluso, J.Barbosa, J.Di Paolo, J.A.Mitchell, S.A.

(2014) J.Med.Chem. 57: 3856-3873

  • DOI: 10.1021/jm500228a
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Spleen tyrosine kinase (Syk) is an attractive drug target in autoimmune, inflammatory, and oncology disease indications. The most advanced Syk inhibitor, R406, 1 (or its prodrug form fostamatinib, 2), has shown efficacy in multiple therapeutic indica ...

    Spleen tyrosine kinase (Syk) is an attractive drug target in autoimmune, inflammatory, and oncology disease indications. The most advanced Syk inhibitor, R406, 1 (or its prodrug form fostamatinib, 2), has shown efficacy in multiple therapeutic indications, but its clinical progress has been hampered by dose-limiting adverse effects that have been attributed, at least in part, to the off-target activities of 1. It is expected that a more selective Syk inhibitor would provide a greater therapeutic window. Herein we report the discovery and optimization of a novel series of imidazo[1,2-a]pyrazine Syk inhibitors. This work culminated in the identification of GS-9973, 68, a highly selective and orally efficacious Syk inhibitor which is currently undergoing clinical evaluation for autoimmune and oncology indications.


    Organizational Affiliation

    Department of Chemistry, ‡Department of Biology, and §Department of Drug Metabolism, Gilead Sciences, Inc. , Branford, Connecticut 06405, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Tyrosine-protein kinase SYK
A, B
291Homo sapiensMutation(s): 0 
Gene Names: SYK
EC: 2.7.10.2
Find proteins for P43405 (Homo sapiens)
Go to Gene View: SYK
Go to UniProtKB:  P43405
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CG9
Query on CG9

Download SDF File 
Download CCD File 
A, B
6-(1H-indazol-6-yl)-N-[4-(morpholin-4-yl)phenyl]imidazo[1,2-a]pyrazin-8-amine
C23 H21 N7 O
XSMSNFMDVXXHGJ-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
CG9IC50: 7.7 - 19416 nM (100) BINDINGDB
CG9EC50: 26 - 1900 nM (100) BINDINGDB
CG9IC50: 7.7 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.085 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.209 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 39.882α = 98.67
b = 41.877β = 90.43
c = 87.405γ = 101.38
Software Package:
Software NamePurpose
HKL-2000data scaling
BOSdata collection
PHASERphasing
PHENIXrefinement
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-04-23
    Type: Initial release
  • Version 1.1: 2014-06-11
    Type: Database references