Catalytic activity:ATP + a protein = ADP + a phosphoprotein. ,Function:Dual specificity kinase that activates the JUN kinases MAPK8 (JNK1) and MAPK9 (JNK2) as well as MAPK14 (p38) but not MAPK1 (ERK2) or MAPK3 (ERK1) . ,PTM:Activated by phosphorylation on Ser/Thr by MAP kinase kinase kinases. ,similarity:Belongs to the protein kinase superfamily. ,similarity:Belongs to the protein kinase superfamily. STE Ser/Thr protein kinase family. MAP kinase kinase subfamily. ,similarity:Contains 1 protein kinase domain. ,subunit:Interacts with SPAG9. ,tissue specificity:Abundant expression is seen in the skeletal muscle. It is also widely expressed in other tissues. ,
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