1XBC

Crystal structure of the syk tyrosine kinase domain with Staurosporin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.294 
  • R-Value Work: 0.246 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

A novel mode of Gleevec binding is revealed by the structure of spleen tyrosine kinase

Atwell, S.Adams, J.M.Badger, J.Buchanan, M.D.Feil, I.K.Froning, K.J.Gao, X.Hendle, J.Keegan, K.Leon, B.C.Muller-Deickmann, H.J.Nienaber, V.L.Noland, B.W.Post, K.Rajashankar, K.R.Ramos, A.Russell, M.Burley, S.K.Buchanan, S.G.

(2004) J Biol Chem 279: 55827-55832

  • DOI: 10.1074/jbc.M409792200
  • Primary Citation of Related Structures:  
    1XBB, 1XBA, 1XBC

  • PubMed Abstract: 
  • Spleen tyrosine kinase (Syk) is a non-receptor tyrosine kinase required for signaling from immunoreceptors in various hematopoietic cells. Phosphorylation of two tyrosine residues in the activation loop of the Syk kinase catalytic domain is necessary ...

    Spleen tyrosine kinase (Syk) is a non-receptor tyrosine kinase required for signaling from immunoreceptors in various hematopoietic cells. Phosphorylation of two tyrosine residues in the activation loop of the Syk kinase catalytic domain is necessary for signaling, a phenomenon typical of tyrosine kinase family members. Syk in vitro enzyme activity, however, does not depend on phosphorylation (activation loop tyrosine --> phenylalanine mutants retain catalytic activity). We have determined the x-ray structure of the unphosphorylated form of the kinase catalytic domain of Syk. The enzyme adopts a conformation of the activation loop typically seen only in activated, phosphorylated tyrosine kinases, explaining why Syk does not require phosphorylation for activation. We also demonstrate that Gleevec (STI-571, Imatinib) inhibits the isolated kinase domains of both unphosphorylated Syk and phosphorylated Abl with comparable potency. Gleevec binds Syk in a novel, compact cis-conformation that differs dramatically from the binding mode observed with unphosphorylated Abl, the more Gleevec-sensitive form of Abl. This finding suggests the existence of two distinct Gleevec binding modes: an extended, trans-conformation characteristic of tight binding to the inactive conformation of a protein kinase and a second compact, cis-conformation characteristic of weaker binding to the active conformation. Finally, the Syk-bound cis-conformation of Gleevec bears a striking resemblance to the rigid structure of the nonspecific, natural product kinase inhibitor staurosporine.


    Organizational Affiliation

    Structural GenomiX, Inc., 10505 Roselle Street, San Diego, CA 92121, USA. satwell@stromix.com



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Tyrosine-protein kinase SYKA291Homo sapiensMutation(s): 0 
Gene Names: SYK
EC: 2.7.1.112 (PDB Primary Data), 2.7.10.2 (UniProt)
Find proteins for P43405 (Homo sapiens)
Explore P43405 
Go to UniProtKB:  P43405
NIH Common Fund Data Resources
PHAROS  P43405
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
STU
Query on STU

Download CCD File 
A
STAUROSPORINE
C28 H26 N4 O3
HKSZLNNOFSGOKW-FYTWVXJKSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
STUIC50:  12   nM  Binding MOAD
STOIC50:  1   nM  BindingDB
STOIC50:  60   nM  BindingDB
STOIC50:  0.10000000149011612   nM  BindingDB
STOIC50:  1.2999999523162842   nM  BindingDB
STOIC50 :  12   nM  PDBBind
STOIC50:  0.44999998807907104   nM  BindingDB
STOIC50:  1.100000023841858   nM  BindingDB
STOKd:  7   nM  BindingDB
STOKd:  14   nM  BindingDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.294 
  • R-Value Work: 0.246 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 40.324α = 90
b = 84.65β = 90
c = 90.904γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
TRUNCATEdata reduction
REFMACrefinement
CCP4data scaling
TRUNCATEdata scaling

Structure Validation

View Full Validation Report



Entry History 

Revision History 

  • Version 1.0: 2004-11-02
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description