1UIX image
Deposition Date 2003-07-23
Release Date 2003-10-21
Last Version Date 2024-11-20
Entry Detail
PDB ID:
1UIX
Keywords:
Title:
Coiled-coil structure of the RhoA-binding domain in Rho-kinase
Biological Source:
Source Organism:
Bos taurus (Taxon ID: 9913)
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.80 Å
R-Value Free:
0.23
R-Value Work:
0.19
R-Value Observed:
0.21
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Rho-associated kinase
Gene (Uniprot):ROCK2
Chain IDs:A, B
Chain Length:71
Number of Molecules:2
Biological Source:Bos taurus
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MSE A MET SELENOMETHIONINE
Primary Citation
Parallel coiled-coil association of the RhoA-binding domain in Rho-kinase
J.Biol.Chem. 278 46046 46051 (2003)
PMID: 12954645 DOI: 10.1074/jbc.M306458200

Abstact

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.

Legend

Protein

Chemical

Disease

Primary Citation of related structures