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Protein kinase A in complex with Rho-kinase inhibitors Y-27632, Fasudil, and H-1152P: structural basis of selectivity

Breitenlechner, Christine, Gaßel, Michael, Hidaka, Hiroyoshi, Kinzel, Volker, Huber, Robert, Engh, Richard A and Bossemeyer, Dirk 2003. Protein kinase A in complex with Rho-kinase inhibitors Y-27632, Fasudil, and H-1152P: structural basis of selectivity. Structure 11 (12) , pp. 1595-1607. 10.1016/j.str.2003.11.002

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Abstract

Protein kinases require strict inactivation to prevent spurious cellular signaling; overactivity can cause cancer or other diseases and necessitates selective inhibition for therapy. Rho-kinase is involved in such processes as tumor invasion, cell adhesion, smooth muscle contraction, and formation of focal adhesion fibers, as revealed using inhibitor Y-27632. Another Rho-kinase inhibitor, HA-1077 or Fasudil, is currently used in the treatment of cerebral vasospasm; the related nanomolar inhibitor H-1152P improves on its selectivity and potency. We have determined the crystal structures of HA-1077, H-1152P, and Y-27632 in complexes with protein kinase A (PKA) as a surrogate kinase to analyze Rho-kinase inhibitor binding properties. Features conserved between PKA and Rho-kinase are involved in the key binding interactions, while a combination of residues at the ATP binding pocket that are unique to Rho-kinase may explain the inhibitors' Rho-kinase selectivity. Further, a second H-1152P binding site potentially points toward PKA regulatory domain interaction modulators.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Publisher: Elsevier
ISSN: 0969-2126
Last Modified: 24 Jun 2017 11:00
URI: http://orca-mwe.cf.ac.uk/id/eprint/70174

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