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- W1490673923 abstract "Abstract We purified to homogeneity the Dictyostelium discoideum myosin heavy chain kinase that is implicated in the heavy chain phosphorylation increases that occur during chemotaxis. The kinase is initially found in the insoluble fraction of developed cells. The major purification step was achieved by affinity chromatography using a tail fragment of Dictyostelium myosin (LMM58) expressed in Escherichia coli (De Lozanne, A., Berlot, C. H., Leinwand, L. A., and Spudich, J. A. (1988) J. Cell Biol. 105, 2990-3005). The kinase has an apparent molecular weight of 84,000 as determined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The apparent native molecular weight by gel filtration is 240,000. The kinase catalyzes phosphorylation of myosin heavy chain or LMM58 with similar kinetics, and the extent of phosphorylation for both is 4 mol of phosphate/mol. With both substrates the Vmax is about 18 mumol/min/mg and the Km is 15 microM. The myosin heavy chain kinase is specific to Dictyostelium myosin heavy chain, and the phosphorylated amino acid is threonine. The kinase undergoes autophosphorylation. Each mole of kinase subunit incorporates about 20 mol of phosphates. Phosphorylation of myosin by this kinase inhibits myosin thick filament formation, suggesting that the kinase plays a role in the regulation of myosin assembly." @default.
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- W1490673923 date "1989-09-01" @default.
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- W1490673923 title "Myosin Heavy Chain Kinase from Developed Dictyostelium cells" @default.
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- W1490673923 doi "https://doi.org/10.1016/s0021-9258(18)63823-2" @default.
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