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N-terminus-mediated dimerization of ROCK-I is required for RhoE binding and actin reorganization.

Garg, R; Riento, K; Keep, N; Morris, JD; Ridley, AJ; (2008) N-terminus-mediated dimerization of ROCK-I is required for RhoE binding and actin reorganization. Biochem J , 411 (2) 407 - 414. 10.1042/BJ20071342.

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Abstract

ROCK-I (Rho-associated kinase 1) is a serine/threonine kinase that can be activated by RhoA and inhibited by RhoE. ROCK-I has an N-terminal kinase domain, a central coiled-coil region and a RhoA-binding domain near the C-terminus. We have previously shown that RhoE binds to the N-terminal 420 amino acids of ROCK-I, which includes the kinase domain as well as N-terminal and C-terminal extensions. In the present study, we show that N-terminus-mediated dimerization of ROCK-I is required for RhoE binding. The central coiled-coil domain can also dimerize ROCK-I in cells, but this is insufficient in the absence of the N-terminus to allow RhoE binding. The kinase activity of ROCK-I(1-420) is required for dimerization and RhoE binding; however, inclusion of part of the coiled-coil domain compensates for lack of kinase activity, allowing RhoE to bind. N-terminus-mediated dimerization is also required for ROCK-I to induce the formation of stellate actin stress fibres in cells. These results indicate that dimerization via the N-terminus is critical for ROCK-I function in cells and for its regulation by RhoE.

Type:Article
Title:N-terminus-mediated dimerization of ROCK-I is required for RhoE binding and actin reorganization.
Location:England
DOI:10.1042/BJ20071342
Language:English
Keywords:Actins, Animals, COS Cells, Cercopithecus aethiops, Cytoskeleton, Dimerization, Phosphorylation, Protein Binding, rho GTP-Binding Proteins, rho-Associated Kinases
UCL classification:UCL > School of Life and Medical Sciences > Faculty of Life Sciences > Biosciences (Division of)

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