Catalytic activity:ATP + a protein = ADP + a phosphoprotein. ,enzyme regulation:p38 alpha and beta-dependent phosphorylation increases its activity. Activated by stress-related extracellular stimuli; such as H (2) O (2) , arsenite , anisomycin TNF alpha and also PMA and the calcium ionophore A23187; but to a lesser extent. In vitro , activated by SQSTM1. ,Function:Mediates stress-induced small heat shock protein 27 phosphorylation. ,PTM:Phosphorylated on Thr-182; which is the regulatory phosphorylation site and is located on the T-loop/loop 12. ,similarity:Belongs to the protein kinase superfamily. CAMK Ser/Thr protein kinase family. ,similarity:Contains 1 protein kinase domain. ,subcellular location:Also observed in the nucleus. ,subunit:Interacts with SQSTM1. ,tissue specificity:Expressed ubiquitously. ,
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