The combinatorial control of gene expression by the association of members of different families of transcription factors is a common theme in eukaryotic transcriptional control. The MADS-box transcription factors SRF and Mcm1 represent paradigms for such regulation through their interaction with numerous partner proteins. For example, in Saccharomyces cerevisiae, Mcm1 interacts with the forkhead transcription factor Fkh2. Here, we identify a novel interaction between SRF and the Forkhead transcription factor FOXK1 in human cells. The importance of this interaction is shown for the regulation of the SRF target genes SM alpha-actin and PPGB. The binding of FOXK1 to the SM alpha-actin and PPGB promoters requires the presence of SRF on the promoter. FOXK1 acts as a transcriptional repressor and it represses SM alpha-actin and PPGB expression. Thus FOXK1 represents an additional member of the growing repertoire of transcription factors that can interact with SRF and modulate the transcriptional output from SRF-regulated promoters.
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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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| Evidence ID | Analyze ID | File | Description |
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