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Assessment of Dictyostelium discoideum Response to Acute Mechanical Stimulation
Published on: November 9, 2017
A cAMP-dependent protein kinase is present in differentiating Dictyostelium discoideum cells
1Unité de Biochimie Cellulaire, Départment de Biochimie et Génétique Moléculaire, Institut Pasteur, 28, rue du Docteur Roux, 75724 Paris Cedex 15, France.
Abstract:
We demonstrate the occurrence of a cAMP-dependent protein kinase in Dictyostelium discoideum cells at the terminal stage of differentiation. A cAMP-binding component was purified to homogeneity by affinity chromatography. This subunit inhibits the activity of purified catalytic subunit from beef heart protein kinase; the inhibition is reversed upon addition of cAMP. The protein is highly specific for cAMP and has a dissociation constant of 4 nM. The isolated regulatory subunit is a monomer of 39 K, with a sedimentation coefficient of 3.5S and a frictional coefficient of 1.24. The differences between this regulatory subunit and regulatory subunits of protein kinases from other sources are discussed.
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