'''Crystal Structure of c-AMP Dependent Kinase (PKA) bound to hydroxyfasudil'''
===Crystal Structure of c-AMP Dependent Kinase (PKA) bound to hydroxyfasudil===
==Overview==
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ROCK or Rho-associated kinase, a serine/threonine kinase, is an effector of Rho-dependent signaling and is involved in actin-cytoskeleton assembly and cell motility and contraction. The ROCK protein consists of several domains: an N-terminal region, a kinase catalytic domain, a coiled-coil domain containing a RhoA binding site, and a pleckstrin homology domain. The C-terminal region of ROCK binds to and inhibits the kinase catalytic domains, and this inhibition is reversed by binding RhoA, a small GTPase. Here we present the structure of the N-terminal region and the kinase domain. In our structure, two N-terminal regions interact to form a dimerization domain linking two kinase domains together. This spatial arrangement presents the kinase active sites and regulatory sequences on a common face affording the possibility of both kinases simultaneously interacting with a dimeric inhibitory domain or with a dimeric substrate. The kinase domain adopts a catalytically competent conformation; however, no phosphorylation of active site residues is observed in the structure. We also determined the structures of ROCK bound to four different ATP-competitive small molecule inhibitors (Y-27632, fasudil, hydroxyfasudil, and H-1152P). Each of these compounds binds with reduced affinity to cAMP-dependent kinase (PKA), a highly homologous kinase. Subtle differences exist between the ROCK- and PKA-bound conformations of the inhibitors that suggest that interactions with a single amino acid of the active site (Ala215 in ROCK and Thr183 in PKA) determine the relative selectivity of these compounds. Hydroxyfasudil, a metabolite of fasudil, may be selective for ROCK over PKA through a reversed binding orientation.
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==About this Structure==
==About this Structure==
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[[Category: Jacobs, M.]]
[[Category: Jacobs, M.]]
[[Category: Fasudil kinase]]
[[Category: Fasudil kinase]]
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Revision as of 02:07, 28 July 2008
This article has been automatically seeded. Changes to this page should pertain to the PDB entry only and not to the protein or biomolecule in general.
2ERZ is a Protein complex structure of sequences from Mus musculus. Full crystallographic information is available from OCA.
Reference
The structure of dimeric ROCK I reveals the mechanism for ligand selectivity., Jacobs M, Hayakawa K, Swenson L, Bellon S, Fleming M, Taslimi P, Doran J, J Biol Chem. 2006 Jan 6;281(1):260-8. Epub 2005 Oct 24. PMID:16249185
