LIM domain kinase 1 (LIMK1), LIM domain kinase 2 (LIMK2) (LIMK1, LIMK2)

LIM domain kinase 1 (LIMK1) and LIM domain kinase 2 (LIMK2) are closely related cytoplasmic kinases that play a central role in modulating actin cytoskeleton dynamics through phosphorylation and inactivation of cofilin, an actin depolymerizing factor. Both LIMK1 and LIMK2 possess N-terminal LIM domains (involved in protein-protein interactions), an adjacent PDZ domain, a serine/proline-rich region, and a C-terminal kinase domain that confers dual specificity for serine/threonine and tyrosine residues. They act downstream of Rho-family GTPases and are key effectors in multiple signal transduction pathways, regulating cellular processes such as migration, proliferation, division, and neuronal differentiation. Dysregulation of LIMKs is implicated in various pathologies, notably cancer progression and metastasis, and certain neurological diseases. Both LIMK1 and LIMK2 have distinct, but overlapping, tissue expression patterns and subcellular localizations, contributing to differential biological roles. The proteins are recognized as promising therapeutic targets, and several small-molecule inhibitors have been developed to disrupt their activity in disease contexts.

Other names

LIMK1LIMK2LIM kinasesLIM-domain kinases

LIMK inhibitors typically block kinase activity, preventing phosphorylation/inactivation of cofilin, thereby destabilizing actin cytoskeleton and affecting cell migration, proliferation, and invasion