LIM kinase-1 (LIMK1) and LIM kinase-2 (LIMK2) are actin-binding kinases that phosphorylate members of the ADF/cofilin family of actin binding and filament severing proteins. ADF/cofilin are the only substrates yet identified for the LIM kinases. LIM kinases directly phosphorylate and inactivate members of the cofilin family, resulting in stabilization of filamentous (F)-actin. Lim kinases are activated by signaling through small GTPases of the Rho family. Upstream, LIMK1 is regulated by Pak1, and LIMK2 by the Rho-dependent kinase ROCK. Lim Kinases are activated by PAK (p21-activated kinase). Recent work indicates that LIMK activity is also modulated by HIV-1 viral proteins.
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