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J. Biol. Chem., Vol. 263, Issue 27, 13486-13489, 09, 1988
CM Schworer, RJ Colbran, JR Keefer and TR Soderling
Howard Hughes Medical Institute, Vanderbilt University School of Medicine, Nashville, Tennessee 37232.
Ca2+/calmodulin-dependent protein kinase II (CaM-kinase II) autophosphorylated under limiting conditions (7 microM [gamma-32P]ATP, 500 microM magnesium acetate, 4 degrees C) was analyzed by CNBr cleavage and peptide mapping to determine the site of autophosphorylation that brings about transition of the kinase to the Ca2+-independent form. Reverse phase high performance liquid chromatography (HPLC) (C3) revealed one major CN-Br 32P-peptide (CB1) that eluted at about 6% propanol. This peptide contained [32P]threonine, but almost no [32P]serine, and migrated as a single band (Mr = 3000-3500) in polyacrylamide gels run in the presence of urea and sodium dodecyl sulfate. The properties of CB1 were compared to the properties of a 26-residue synthetic peptide containing the CaM- binding and inhibitory domains as well as a consensus phosphorylation sequence (-Arg-Gln-Glu-Thr-) of rat brain CaM-kinase II (residues 282- 307 and 283-308 of the alpha and beta subunits, respectively). CB1 and the synthetic peptide comigrated in urea/sodium dodecyl sulfate gels, co-eluted from reverse phase HPLC (C3 and C18) and from Sephadex G-50, and exhibited Ca2+-dependent calmodulin-binding properties. When the two peptides were subjected to automated Edman sequence analysis, both exhibited a burst of 32P release at cycle 5, which is consistent with the expected amino-terminal sequence of the two peptides, i.e. His-Arg- Gln-Glu-Thr(PO4)-. These findings indicate that autophosphorylation of Thr286 (alpha subunit) and Thr287 (beta subunit) is responsible for transition of CaM-kinase II to the Ca2+-independent form.
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