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Updated: Dec 31, 2025

Characterization at the Molecular Level using Robust Biochemical Approaches of a New Kinase Protein
Published on: June 30, 2019
LIM kinase 2 (LIMK2) may play an essential role in platelet function
Juliana Antonipillai1, Kevin Mittelstaedt2, Sheena Rigby3
1Atherothrombosis and Vascular Biology, Baker IDI Heart & Diabetes Institute, Melbourne, Victoria, 3004, Australia; St. Vincent's Institute, Fitzroy, Victoria, 3065, Australia; College of Health and Biomedical Sciences, RMIT, Victoria, 3083, Australia.
Abstract:
Actin filaments are highly dynamic structures involved in many cellular processes including cell-to-cell/substrate association and cell motility. The actin cytoskeleton is tightly regulated by actin-binding proteins, which include the members of the ADF (actin-depolymerizing factor)/cofilin family. The members of the LIM kinase family of proteins (LIMK1 and 2) regulate actin dynamics by controlling the binding affinity of ADF/cofilin towards actin. LIMK2 has two major splice variants, LMK2a and LIMK2b. We have generated mice lacking LIMK2a expression (LIMK2a KO), to study its specific role in the regulation of the actin cytoskeleton. The LIMK2a KO mice showed a significant prolonged bleeding complication upon injuries compared to wild type mice. This prolonged bleeding prompted us to check the expression of the LIMK2 protein in platelets as it was previously suggested that it is not expressed in platelets. We showed that human and mouse express LIMK2 in platelets and using our LIMK2a KO mice we have identified a potential key role for LIMK2 in platelet functions including platelet spreading, aggregation and thrombus formation.
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