The Tpl-2 protein serine/threonine kinase was originally identified, in a C-terminally deleted form, as the product of an oncogene associated with the progression of Moloney murine leukemia virus-induced T cell lymphomas in rats. The kinase domain of Tpl-2 is homologous to the Saccharomyces cerevisiae gene product, STE11, which encodes a MAP kinase kinase kinase. This suggested that Tpl-2 might have a similar activity. Consistent with this hypothesis, immunoprecipitated Tpl-2 and Tpl-2deltaC (a C-terminally truncated mutant) phosphorylated and activated recombinant fusion proteins of the mammalian MAP kinase kinases, MEK-1 and SEK-1, in vitro. Furthermore, transfection of Tpl-2 into COS-1 cells or Jurkat T cells. markedly activated the MAP kinases, ERK-1 and SAP kinase (JNK), which are substrates for MEK-1 and SEK-1, respectively. Tpl-2, therefore, is a MAP kinase kinase kinase which can activate two MAP kinase pathways. After Raf and Mos, Tpl-2 is the third serine/threonine oncoprotein kinase that has been shown to function as a direct activator of MEK-1.
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| Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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| Evidence ID | Analyze ID | Gene | Gene Systematic Name | Phenotype | Experiment Type | Experiment Type Category | Mutant Information | Strain Background | Chemical | Details | Reference |
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| Evidence ID | Analyze ID | Gene | Gene Systematic Name | Disease Ontology Term | Disease Ontology Term ID | Qualifier | Evidence | Method | Source | Assigned On | Reference |
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| Evidence ID | Analyze ID | Regulator | Regulator Systematic Name | Target | Target Systematic Name | Direction | Regulation of | Happens During | Regulator Type | Direction | Regulation Of | Happens During | Method | Evidence | Strain Background | Reference |
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| Site | Modification | Modifier | Source | Reference |
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| Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Allele | Assay | Annotation | Action | Phenotype | SGA score | P-value | Source | Reference | Note |
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| Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Assay | Annotation | Action | Modification | Source | Reference | Note |
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| Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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| Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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