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Phosphorylation of Ribosome-associated Protein by an Adenosine 3':5'-cyclic Monophosphate-dependent Protein Kinase: Location of the Microsomal Receptor and Protein Kinase

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Specialty Science
Date 1971 May 1
PMID 4325002
Citations 17
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Abstract

In the adrenal cortex, the adenosine 3':5'-cyclic monophosphate (cAMP)-receptor protein and the cAMP-dependent protein kinase are located in both the cytosol and endoplasmic reticulum. The cAMP-dependent protein kinase from the cytosol catalyzes the phosphorylation of ribosome-associated protein. Ribosomes washed in 0.5 M NH(4)Cl retain the substrate of the protein kinase reaction, but are dependent on the NH(4)Cl extract for in vitro protein synthesis. Dissociation of the 80S ribosomes by 0.88 M KCl, however, releases the ribosome-associated (protein) substrate of the phosphorylation reaction.

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