Coiled-coil structure of the RhoA-binding domain in Rho-kinase

Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.219 

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Parallel coiled-coil association of the RhoA-binding domain in Rho-kinase

Shimizu, T.Ihara, K.Maesaki, R.Amano, M.Kaibuchi, K.Hakoshima, T.

(2003) J Biol Chem 278: 46046-46051

  • DOI: https://doi.org/10.1074/jbc.M306458200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Rho-kinase is a serine/threonine protein kinase that regulates cytoskeletal events in cells. The enzyme activity of Rho-kinase is auto-inhibited in the free state but is activated through direct binding to the small GTPase Rho in the GTP-bound form. The crystal structure of the Rho-binding domain (RhoBD) of Rho-kinase has been determined at 1.8-A resolution by the multi-wavelength anomalous dispersion technique. The structure shows that RhoBD dimerizes to form a parallel coiled-coil with long consecutive alpha-helices extended to approximately 97 A and suggests that free Rho-kinase can also form a dimer through parallel self-association. At the middle region of the coiled-coil, the polypeptide chains are flexible and display loose "knobs-into-holes" packing of the side chains from both chains. RhoBD residues that have been shown to be critical for Rho-binding are spread in the positively charged C-terminal region. The parallel coiled-coil structure of our Rho-kinase RhoBD in the free form is different from the anti-parallel coiled-coil structure of RhoBD of protein kinase N when complexed with RhoA. Implications derived from these structural studies in relation to the mechanism of Rho-kinase activation will be addressed with previously reported experimental data.

  • Organizational Affiliation

    Structural Biology Laboratory, Nara Institute of Science and Technology, and CREST, Japan Science and Technology Corporation, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Rho-associated kinase
A, B
71Bos taurusMutation(s): 1 
EC: 2.7.1
Find proteins for Q28021 (Bos taurus)
Explore Q28021 
Go to UniProtKB:  Q28021
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ28021
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
A, B
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.219 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 148α = 90
b = 26.1β = 90.4
c = 39.6γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-10-21
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-12-27
    Changes: Data collection, Database references, Derived calculations