Catalytic activity:ATP + a protein = ADP + a phosphoprotein. ,cofactor:Magnesium. ,Domain:The TXY motif contains the threonine and tyrosine residues whose phosphorylation activates the MAP kinases. ,enzyme regulation:Activated by threonine and tyrosine phosphorylation by either of two dual specificity kinases , MAP2K3 or MAP2K6 , and potentially also MAP2K4. Inhibited by dual specificity phosphatases , such as DUSP1. Specifically inhibited by the binding of pyridinyl-imidazole compounds , which are cytokine-suppressive anti-inflammatory drugs (CSAID) . Isoform Mxi2 is 100-fold less sensitive to these agents than the other isoforms and is not inhibited by DUSP1. Isoform Exip is not activated by MAP2K6. ,Function:Responds to activation by environmental stress , pro-inflammatory cytokines and lipopolysaccharide (LPS) by phosphorylating a number of transcription factors , such as ELK1 and ATF2 and several downstream kinases , such as MAPKAPK2 and MAPKAPK5. Plays a critical role in the production of some cytokines , for example IL-6. May play a role in stabilization of EPO mRNA during hypoxic stress. Isoform Mxi2 activation is stimulated by mitogens and oxidative stress and only poorly phosphorylates ELK1 and ATF2. Isoform Exip may play a role in the early onset of apoptosis. ,online information:P38 mitogen-activated protein kinases entry ,PTM:Dually phosphorylated on Thr-180 and Tyr-182 , which activates the enzyme. ,PTM:Phosphorylated upon DNA damage , probably by ATM or ATR. ,similarity:Belongs to the protein kinase superfamily. CMGC Ser/Thr protein kinase family. MAP kinase subfamily. ,similarity:Contains 1 protein kinase domain. ,subunit:Binds to a kinase interaction motif within the protein tyrosine phosphatase , PTPRR. This interaction retains MAPK14 in the cytoplasm and prevents nuclear accumulation. Interacts with SPAG9 (By similarity) . Interacts with NP60 and FAM48A. ,tissue specificity:Brain , heart , placenta , pancreas and skeletal muscle. Expressed to a lesser extent in lung , liver and kidney. ,
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