TAO2 kinase domain-staurosporine structure

Experimental Data Snapshot

  • Resolution: 2.55 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.203 

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Crystal structure of the MAP3K TAO2 kinase domain bound by an inhibitor staurosporine.

Zhou, T.J.Sun, L.G.Gao, Y.Goldsmith, E.J.

(2006) Sheng Wu Hua Xue Yu Sheng Wu Wu Li Xue Bao (Shanghai) 38: 385-392

  • DOI: https://doi.org/10.1111/j.1745-7270.2006.00173.x
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Mitogen-activated protein kinase (MAPK) signal transduction pathways are ubiquitous in eukaryotic cells, which transfer signals from the cell surface to the nucleus, controlling multiple cellular programs. MAPKs are activated by MAPK kinases [MAP2Ks or MAP/extracellular signal-regulated kinase (ERK) kinases (MEK)], which in turn are activated by MAPK kinase kinases (MAP3Ks). TAO2 is a MAP3K level kinase that activates the MAP2Ks MEK3 and MEK6 to activate p38 MAPKs. Because p38 MAPKs are key regulators of expression of inflammatory cytokines, they appear to be involved in human diseases such as asthma and autoimmunity. As an upstream activator of p38s, TAO2 represents a potential drug target. Here we report the crystal structure of active TAO2 kinase domain in complex with staurosporine, a broad-range protein kinase inhibitor that inhibits TAO2 with an IC50 of 3 mM. The structure reveals that staurosporine occupies the position where the adenosine of ATP binds in TAO2, and the binding of the inhibitor mimics many features of ATP binding. Both polar and nonpolar interactions contribute to the enzyme-inhibitor recognition. Staurosporine induces conformational changes in TAO2 residues that surround the inhibitor molecule, but causes very limited global changes in the kinase. The structure provides atomic details for TAO2-staurosporine interactions, and explains the relatively low potency of staurosporine against TAO2. The structure presented here should aid in the design of inhibitors specific to TAO2 and related kinases.

  • Organizational Affiliation

    Department of Biochemistry, University of Texas Southwestern Medical Center at Dallas, Dallas, TX 75390-9038, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Serine/threonine-protein kinase TAO2
A, B
309Rattus norvegicusMutation(s): 1 
Gene Names: tao2
Find proteins for Q9JLS3 (Rattus norvegicus)
Explore Q9JLS3 
Go to UniProtKB:  Q9JLS3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9JLS3
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on SEP
A, B
Experimental Data & Validation

Experimental Data

  • Resolution: 2.55 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.203 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 186.019α = 90
b = 186.019β = 90
c = 94.641γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-09-05
    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: 2017-10-18
    Changes: Refinement description