Purification and properties of a nuclear protein kinase associated with ribonucleic acid polymerase I
- 1 February 1978
- journal article
- research article
- Published by Portland Press Ltd. in Biochemical Journal
- Vol. 169 (2), 355-359
- https://doi.org/10.1042/bj1690355
Abstract
A cyclic AMP-dependent nuclear protein kinase was found to be closely associated with rat liver nucleolar RNA polymerase I throughout most of its purification. This protein kinase was purified to near homogeneity. It exhibits a number of unusual catalytic properties, including the inability to utilize Mn2+ when RNA polymerase is the substrate and the ability to phosphorylate both acidic and basic substrates. Phosphorylation of RNA polymerase I by this protein kinase results in the formation of phosphoester bonds characteristic of phosphoserine and phosphothreonine. Radioautography of polyacrylamide-gel electrophoretograms of the phosphorylated RNA polymerase I revealed that the 32P was located primarily on enzyme subunits SA1, SA3, SA5 and SA6.This publication has 10 references indexed in Scilit:
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