crystal structure of the Rho-kinase kinase domain

Experimental Data Snapshot

  • Resolution: 2.40 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.197 

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This is version 1.3 of the entry. See complete history


Molecular mechanism for the regulation of rho-kinase by dimerization and its inhibition by fasudil

Yamaguchi, H.Kasa, M.Amano, M.Kaibuchi, K.Hakoshima, T.

(2006) Structure 14: 589-600

  • DOI: https://doi.org/10.1016/j.str.2005.11.024
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Rho-kinase is a key regulator of cytoskeletal events and a promising drug target in the treatment of vascular diseases and neurological disorders. Unlike other protein kinases, Rho-kinase requires both N- and C-terminal extension segments outside the kinase domain for activity, although the details of this requirement have been elusive. The crystal structure of an active Rho-kinase fragment containing the kinase domain and both the extensions revealed a head-to-head homodimer through the N-terminal extension forming a helix bundle that structurally integrates the C-terminal extension. This structural organization enables binding of the C-terminal hydrophobic motif to the N-terminal lobe, which defines the correct disposition of helix alphaC that is important for the catalytic activity. The bound inhibitor fasudil significantly alters the conformation and, consequently, the mode of interaction with the catalytic cleft that contains local structural changes. Thus, both kinase and drug conformational pliability and stability confer selectivity.

  • Organizational Affiliation

    Structural Biology Laboratory, Nara Institute of Science and Technology, 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 protein kinase 2
A, B
402Bos taurusMutation(s): 0 
Gene Names: ROCK2
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
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on M77

Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]
C14 H17 N3 O2 S
Binding Affinity Annotations 
IDSourceBinding Affinity
M77 BindingDB:  2F2U Ki: min: 330, max: 330 (nM) from 2 assay(s)
Kd: min: 45, max: 78 (nM) from 2 assay(s)
IC50: min: 71, max: 1.17e+4 (nM) from 15 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 2.40 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.197 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 102.531α = 90
b = 102.531β = 90
c = 257.185γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-04-25
    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: 2023-10-25
    Changes: Data collection, Database references, Derived calculations, Refinement description, Structure summary