catalytic activity:ATP + a protein = ADP + a phosphoprotein. ,cofactor:Magnesium. ,enzyme regulation:Activated by phosphorylation by specific MAP kinase kinase kinases such as MAP3K1/MEKK1 , MAP3K3/MEKK3 , MAP3K11/MLK3 and MAP3K12/DLK. ,function:Stress activated , dual specificity kinase that activates the JUN kinases MAPK8/JNK1 , MAPK9/JNK2 and MAPK10/JNK3. ,PTM:Activated by phosphorylation on Ser/Thr. ,similarity:Belongs to the protein kinase superfamily. STE Ser/Thr protein kinase family. MAP kinase kinase subfamily. ,similarity:Contains 1 protein kinase domain. ,tissue specificity:Ubiquitous; with highest level of expression in skeletal muscle. Isoform 3 is found at low levels in placenta , fetal liver , and skeletal muscle. ,
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