Catalytic activity:ATP + a protein = ADP + a phosphoprotein. ,Function:Activates the JNK pathway. Plays a role in the reorganization of the actin cytoskeleton and in the formation of filopodia. Phosphorylates and inactivates the protein phosphatase SSH1 , leading to increased inhibitory phosphorylation of the actin binding/depolymerizing factor cofilin. Decreased cofilin activity may lead to stabilization of actin filaments. Phosphorylates ARHGEF2. ,PTM:Autophosphorylated on serine residues when activated by CDC42/p21. ,PTM:Phosphorylated on tyrosine residues upon stimulation of FGFR2. ,similarity:Belongs to the protein kinase superfamily. STE Ser/Thr protein kinase family. STE20 subfamily. ,similarity:Contains 1 CRIB domain. ,similarity:Contains 1 protein kinase domain. ,subunit:Interacts with FGFR2 and GRB2 (By similarity) . Interacts tightly with GTP-bound but not GDP-bound CDC42/p21 and weakly with RAC1. Interacts with its substrate ARHGEF2. ,tissue specificity:Highest expression in prostate , testis and colon. ,
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