catalytic activity:ATP + a protein = ADP + a phosphoprotein. ,cofactor:Magnesium. ,enzyme regulation:Homodimerization via the leucine zipper domains is required for autophosphorylation and subsequent activation. ,function:Activates the JUN N-terminal pathway. ,PTM:Autophosphorylation on serine and threonine residues within the activation loop plays a role in enzyme activation. Thr-312 is likely to be the main autophosphorylation site. ,similarity:Belongs to the protein kinase superfamily. STE Ser/Thr protein kinase family. MAP kinase kinase kinase subfamily. ,similarity:Contains 1 protein kinase domain. ,similarity:Contains 1 SH3 domain. ,subunit:Homodimer. ,tissue specificity:Expressed in epithelial tumor cell lines of colonic , breast and esophageal origin. ,
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