Crystal Structure of the TAO2 Kinase Domain: Activation and Specifity of a Ste20p MAP3K

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.211 

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Crystal Structure of the TAO2 Kinase Domain; Activation and Specificity of a Ste20p MAP3K.

Zhou, T.Raman, M.Gao, Y.Earnest, S.Chen, Z.Machius, M.Cobb, M.H.Goldsmith, E.J.

(2004) Structure 12: 1891-1900

  • DOI: https://doi.org/10.1016/j.str.2004.07.021
  • Primary Citation of Related Structures:  
    1U5Q, 1U5R

  • PubMed Abstract: 

    TAO2 is a mitogen-activated protein kinase kinase kinase (MAP3K) that doubly phosphorylates and activates the MAP kinase kinases (MAP2Ks) MEK3 and MEK6. The structure of the kinase domain of TAO2 (1-320) has been solved in its phosphorylated active conformation. The structure, together with structure-based mutagenic analysis, reveals that positively charged residues in the substrate binding groove mediate the first step in the dual phosphorylation of MEK6, on the threonine residue in the motif DS*VAKT*I (*denotes phosphorylation site) of MEK6. TAO2 is a Ste20p homolog, and the structure of active TAO2, in comparison with that of low-activity p21-activated protein kinase (PAK1), a Ste20p-related MAP4K, reveals how this group of kinases is activated by phosphorylation. Finally, active TAO2 displays unusual interactions with ATP, involving, in part, a subgroup-specific C-terminal extension of TAO2. The observed interactions may be useful in making specific inhibitors of TAO kinases.

  • Organizational Affiliation

    Department of Biochemistry, The University of Texas Southwestern Medical Center at Dallas, 5323 Harry Hines Boulevard, Dallas, TX 75390, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
serine/threonine protein kinase TAO2
A, B
348Rattus norvegicusMutation(s): 1 
Gene Names: serine/threonine protein kinase 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
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.211 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 186.467α = 90
b = 186.467β = 90
c = 91.1γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
SCALEPACKdata scaling
HKL-2000data reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-10-12
    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: 2023-08-23
    Changes: Data collection, Database references, Derived calculations, Refinement description