Catalytic activity:ATP + a protein = ADP + a phosphoprotein. ,cofactor:Magnesium. ,enzyme regulation:By autophosphorylation on threonine. ,Function:Regulates downstream kinases in response to environmental stress. May also have a function in regulating the actin cytoskeleton. ,PTM:Phosphorylated upon DNA damage , probably by ATM or ATR. ,similarity:Belongs to the protein kinase superfamily. STE Ser/Thr protein kinase family. STE20 subfamily. ,similarity:Contains 1 protein kinase domain. ,subunit:Binds to and phosphorylates PAK1. Interacts with chloride channel proteins SLC12A6 isoform 2 , SLC12A1 and SLC12A2 but not with SLC12A4 and SLC12A7 , possibly establishing sensor/signaling modules that initiate the cellular response to environmental stress. Binds to and phosphorylates RELL1 , RELL2 AND RELT. ,tissue specificity:Ubiquitously expressed in all tissue examined. ,
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