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• W2023409250 abstract "Previous in vivo studies have shown that the rabbit progesterone receptor undergoes two phosphorylation reactions: one basal and a second one which is hormone-dependent. We report here on the presence and characteristics of a kinase activity found in receptor preparations highly purified by immunoaffinity chromatography. 1. This kinase activity is not due to the receptor molecule itself since the two proteins may be separated by several chromatographic and immunological methods. 2. The presence of the kinase in receptor preparations is not an artefact of the purification procedure. The kinase binds to the receptor as shown by coelution in immunoaffinity experiments and during various chromatographies. This interaction probably takes place in vivo and is not artefactually formed during solubilization of the receptor since the kinase also copurifies with receptors isolated from the uterine nuclei of progestin-treated rabbits. 3. This enzyme may be classified as a casein kinase since it readily phosphorylates the latter substrate (Km approximately equal to 0.15 mg/ml) and is not regulated by cyclic nucleotides, Ca2+ and calmodulin or phospholipids. Its classification as a casein kinase I or II is difficult since on the one hand it is inhibited by heparin, activated by polyamines and may use both ATP and GTP, but on the other hand it modifies only serine residues, and is not inhibited by heparin when the receptor itself is employed as a substrate. 4. The kinase which copurifies with the receptor does not mimic in vitro the effects of the hormone-dependent phosphorylation of the receptor observed in vivo: there is no enhancement of kinase activity by the hormone, and the phosphorylated receptor does not exhibit the characteristic upshift in its electrophoretic mobility. Thus either this kinase is not the enzyme responsible for the hormone-dependent receptor phosphorylation or, during purification, a factor has been lost which is necessary for retaining the hormone dependency of the reaction." @default.
• W2023409250 created "2016-06-24" @default.
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• W2023409250 date "1987-12-01" @default.
• W2023409250 modified "2023-09-25" @default.
• W2023409250 title "Characterization of a casein kinase which interacts with the rabbit progesterone receptor. Differences with the in vivo hormone-dependent phosphorylation" @default.
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• W2023409250 doi "https://doi.org/10.1111/j.1432-1033.1987.tb13666.x" @default.
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