title: Characterization of calf-ovary adenosine;3':5'-monophosphate-dependent protein kinases and adenosine-3':5'-monophosphate-binding proteins.
abstract: Protein phosphokinase activity from the calf ovary cytosol (105000 X g supernatant fraction) has been resolved by chromatography and polyacrylamide gel electrophoresis into two major protein kinases, PK-H1 and PK-H2, both dependent on adenosine 3':5'-monophosphate (cyclic AMP). The enzymes have similar molecular weights (230000) and substrate specificities but differ in their cyclic-AMP-dependency and stimulation by cyclic AMP. The differences have been explained by the presence in PK-H1 of a unique cyclic-AMP-binding protein which has little catalytic activity associated with it. The cyclic-AMP-binding protein has a high affinity for cyclic AMP and in addition is able to inhibit the activity of the isolated catalytic subunit. The ovarian cyclic-AMP-dependent protein kinases have properties similar to those found in other tissues. They can be dissociated into catalytic and regulatory subunits and are inhibited by a heat-stable protein inhibitor isolated from rabbit skeletal muscle. Preincubation of the cytosol with high levels of cyclic AMP resulted in additional cyclic-AMP-dependent protein kinases and cyclic-AMP-binding proteins which include protein kinases and binding proteins of greater than 400 000 molecular weight.
mesh_terms: D000818:Animals; D001665:Binding Sites; D002417:Cattle; D000242:Cyclic AMP / Q000378:metabolism* / Q000494:pharmacology; D003600:Cytosol / Q000201:enzymology; D004355:Drug Stability; D004789:Enzyme Activation / Q000187:drug effects; D005260:Female; D006358:Hot Temperature; D007527:Isoenzymes / Q000378:metabolism; D007700:Kinetics; D008970:Molecular Weight; D009124:Muscle Proteins / Q000302:isolation & purification / Q000494:pharmacology; D010053:Ovary / Q000201:enzymology / Q000378:metabolism*; D011485:Protein Binding; D011494:Protein Kinases / Q000378:metabolism*; D011817:Rabbits; D011955:Receptors, Drug
chemical_list: D007527:Isoenzymes; D009124:Muscle Proteins; D011955:Receptors, Drug; D000242:Cyclic AMP; D011494:Protein Kinases