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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Pederson, T. Fung, P. A. Labrecque, R. |
| Description | Author Affiliation: Fung PA ( Cell Biology Group, Worcester Foundation for Biomedical Research, Shrewsbury, MA 01545, USA.); |
| Abstract | The human C1 heterogeneous nuclear ribonucleoprotein particle protein (hnRNP protein) undergoes a cycle of phosphorylation-dephosphorylation in HeLa cell nuclear extracts that modulates the binding of this protein to pre-mRNA. We now report that hyperphosphorylation of the C1 hnRNP protein is mediated by a kinase activity in nuclear extracts that is RNA-dependent. Although the basal phosphorylation of the C1 hnRNP protein in nuclear extracts reflects a casein kinase II-type activity, its RNA-dependent hyperphosphorylation appears to be mediated by a different kinase. This is indicated by the unresponsiveness of the RNA-stimulated hyperphosphorylation to casein kinase II inhibitors, and the distinct glycerol gradient sedimentation profiles of the basal versus RNA-stimulated C1 hnRNP protein phosphorylation activities from nuclear extracts. RNA-dependent phosphorylation was observed both for a histidine-tagged recombinant human C1 hnRNP protein added to nuclear extracts and also for the endogenous C1 hnRNP protein. Additional results rule out protein kinase A, protein kinase C, calmodulin-dependent protein kinase II, and double-stranded RNA-activated protein kinase as the enzymes responsible for the RNA-dependent hyperphosphorylation of the C1 hnRNP protein. These results reveal the existence in nuclear extracts of an RNA-dependent protein kinase activity that hyperphosphorylates a known pre-mRNA binding protein, and define an additional element to be integrated into the current picture of how nuclear proteins are regulated by phosphorylation. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 4 |
| Volume Number | 94 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1997-03-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Heterogeneous-Nuclear Ribonucleoprotein Group C Nuclear Proteins Metabolism Protein Kinases RNA, Nuclear RNA-Binding Proteins Ribonucleoproteins Casein Kinase II Cell Nucleus Enzyme Inhibitors Pharmacology HeLa Cells Heterogeneous-Nuclear Ribonucleoproteins Models, Biological Phosphorylation Protein-Serine-Threonine Kinases Antagonists & Inhibitors Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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