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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Hendrickson, R. C. Bender, T. P. Shabanowitz, J. Aziz, N. Miglarese, M. R. Hunt, D. F. Sturgill, T. W. |
| Description | Author Affiliation: Aziz N ( Department of Pharmacology, University of Virginia, Charlottesville 22908, USA.); |
| Abstract | The c-myb protooncogene encodes a highly conserved transcription factor that functions as both an activator and a repressor of transcription. The v-myb oncogenes of E26 leukemia virus and avian myeloblastosis virus encode proteins that are truncated at both the amino and the carboxyl terminus, deleting portions of the c-Myb DNA-binding and negative regulatory domains. This has led to speculation that the deleted regions contain important regulatory sequences. We previously reported that the 42-kDa mitogen-activated protein kinase (p42mapk) phosphorylates chicken and murine c-Myb at multiple sites in the negative regulatory domain in vitro, suggesting that phosphorylation might provide a mechanism to regulate c-Myb function. We now report that three tryptic phosphopeptides derived from in vitro phosphorylated c-Myb comigrate with three tryptic phosphopeptides derived from metabolically labeled c-Myb immunoprecipitated from murine erythroleukemia cells. At least two of these peptides are phosphorylated on serine-528. Replacement of serine-528 with alanine results in a 2- to 7-fold increase in the ability of c-Myb to transactivate a Myb-responsive promoter/reporter gene construct. These findings suggest that phosphorylation serves to regulate c-Myb activity and that loss of this phosphorylation site from the v-Myb proteins may contribute to their transforming potential. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 14 |
| Volume Number | 92 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1995-08-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Oncogenes Proto-Oncogene Proteins Metabolism Transcription, Genetic Amino Acid Sequence Animals Avian Myeloblastosis Virus Genetics Cell Line Cercopithecus Aethiops DNA-Binding Proteins Gene Expression Regulation, Neoplastic Glutathione Transferase Biosynthesis Isolation & Purification Kidney Leukemia Virus, Murine Leukemia, Erythroblastic, Acute Mice Molecular Sequence Data Peptide Mapping Phosphopeptides Chemistry Phosphoproteins Protein-Tyrosine Kinases Proto-Oncogene Proteins C-myb Recombinant Fusion Proteins Regulatory Sequences, Nucleic Acid Serine Transcriptional Activation Transfection Tumor Cells, Cultured 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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