kcat of p38α (MAPK14) protein kinase for ATP hydrolysis

Value 0.562 sec^-1 Range: ±0.007 sec^-1
Organism Bacteria Escherichia coli
Reference Zhang YY, Mei ZQ, Wu JW, Wang ZX. Enzymatic activity and substrate specificity of mitogen-activated protein kinase p38alpha in different phosphorylation states. J Biol Chem. 2008 Sep 26 283(39):26591-601. doi: 10.1074/jbc.M801703200. p.26596 left column 2nd paragraph & p.26597 table 1PubMed ID18669639
Method "To characterize the biochemical properties of various forms of p38a, [researchers] first measured the ATPase and kinase activities of p38a in various phosphorylation states using an enzyme-coupled spectrophotometric assay (refs 29, 30). All steady-state kinetic studies were performed at pH 7.0 and 25 °C."
Comments "Direct curve fitting of the data to the Michaelis-Menten equation yielded kcat and Km values, which were 0.562±0.007 s^-1 and 212±12.6µM, respectively, for the p38a/pTpY (p38a phosphorylated on both Thr-180 and Tyr-182)-catalyzed ATP hydrolysis."
Entered by Uri M
ID 110567