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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Dent, P. Sturgill, T. W. |
| Description | Author Affiliation: Dent P ( Howard Hughes Medical Institute, University of Virginia, Charlottesville 22908.); |
| Abstract | The serine-threonine protein kinase Raf-1 is an important signal transducer in mitogenesis, phosphorylating and activating mitogen-activated protein (MAP) kinase kinase. Raf-1 activation in vivo is dependent on Ras, but the mechanism of Raf activation is unknown. The ability of preparations of plasma membranes to activate exogenous (His)6-Raf-1 was studied. Plasma membranes of v-Ras-transformed NIH 3T3 cells, but not parental cells, enhanced MAP kinase kinase kinase (MAPKKK) activity dependent on addition of (His)6-Raf-1 and ATP/Mg. Treatment of membranes with concentrations of Bacillus cereus phosphatidylcholine-specific phospholipase C that activated Raf-1 in vivo failed to enhance MAPKKK activity in vitro. Activation of (His)6-Raf-1 in vitro by membranes was dependent on binding to Ras. Membranes from v-Src-transformed cells also activated (His)6-Raf-1 and synergized with v-Ras membranes. Serum-treatment of NIH 3T3 cells stimulated the ability of membranes to activate (His)6-Raf-1. Activated (His)6-Raf-1 could be recovered on Ni(2+)-agarose, and this methodology was used to demonstrate that activation by membranes was ATP dependent. These findings demonstrate Ras- and ATP-dependent step(s) for Raf-1 activation by plasma membranes in vitro. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 20 |
| Volume Number | 91 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1994-10-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Genes, Ras Protein-Serine-Threonine Kinases Metabolism Proto-Oncogene Proteins 3T3 Cells Amino Acid Sequence Animals Cell Line Cell Line, Transformed Cell Membrane Culture Media Enzyme Activation Fibroblasts Enzymology MAP Kinase Kinase Kinases Mice Mitogen-Activated Protein Kinase Kinases Molecular Sequence Data Protein Kinases Isolation & Purification Proto-Oncogene Proteins C-raf Recombinant Proteins Spodoptera Type C Phospholipases Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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