2.7.11.7 phosphoprotein 15 to 20 autophosphorylation sites in MHCK-B reside in the N-rich region of the kinase. Autophosphorylation of full-length MHCK-B has no effect on the kinase activity of the enzyme 721946 2.7.11.7 phosphoprotein association with the actin cytoskeleton causes a drastic increase in the autophosphorylation activity of MHCK A, which is then activated 693303 2.7.11.7 phosphoprotein autophosphorylation at Thr825 activates MHCK A at least 50fold, dephosphorylation of the residue reduces the activity. The phosphorylated Thr825 docks intramolecularly into the phosphate-pocket. Allosteric activation is predicted to involve a conformational change in Arg734, which bridges the bound phosphate to Asp762 in a key active site loop 722716 2.7.11.7 phosphoprotein MHCK A performs autophosphorylation, facilitated by F-actin requiring the coiled coil domain of the enzyme 662394