Dorsal-mediated repression requires the formation of a multiprotein repression complex at the ventral silencer.

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dc.contributor.authorValentine, S.
dc.contributor.authorChen, G.
dc.contributor.authorShandala, T.
dc.contributor.authorFernandez, J.
dc.contributor.authorMische, S.
dc.contributor.authorSaint, R.
dc.contributor.authorCourey, A.
dc.date.issued1998
dc.description.abstractDorsal functions as both an activator and repressor of transcription to determine dorsoventral fate in the Drosophila melanogaster embryo. Repression by Dorsal requires the corepressor Groucho (Gro) and is mediated by silencers termed ventral repression regions (VRRs). A VRR in zerknüllt (zen) contains Dorsal binding sites as well as an essential element termed AT2. We have identified and purified an AT2 DNA binding activity in embryos and shown it to consist of cut (ct) and dead ringer (dri) gene products. Studies of loss-of-function mutations in ct and dri demonstrate that both genes are required for the activity of the AT2 site. Dorsal and Dri both bind Gro, acting cooperatively to recruit it to the DNA. Thus, ventral repression may require the formation of a multiprotein complex at the VRR. This complex includes Dorsal, Gro, and additional DNA binding proteins, which appear to convert Dorsal from an activator to a repressor by enabling it to recruit Gro to the template. By showing how binding site context can dramatically alter transcription factor function, these findings help clarify the mechanisms responsible for the regulatory specificity of transcription factors.
dc.identifier.citationMolecular and Cellular Biology, 1998; 18(11):6584-6594
dc.identifier.doi10.1128/MCB.18.11.6584
dc.identifier.issn0270-7306
dc.identifier.issn1098-5549
dc.identifier.urihttp://hdl.handle.net/2440/11478
dc.language.isoen
dc.publisherAMER SOC MICROBIOLOGY
dc.source.urihttps://doi.org/10.1128/mcb.18.11.6584
dc.subjectAnimals
dc.subjectDrosophila melanogaster
dc.subjectDNA-Binding Proteins
dc.subjectHomeodomain Proteins
dc.subjectInsect Proteins
dc.subjectDrosophila Proteins
dc.subjectNerve Tissue Proteins
dc.subjectNuclear Proteins
dc.subjectPhosphoproteins
dc.subjectTranscription Factors
dc.subjectRepressor Proteins
dc.subjectOligodeoxyribonucleotides
dc.subjectDNA Footprinting
dc.subjectGene Expression Regulation, Developmental
dc.subjectBinding Sites
dc.subjectMorphogenesis
dc.subjectGenes, Insect
dc.subjectBasic Helix-Loop-Helix Transcription Factors
dc.subjectTranscriptional Activation
dc.titleDorsal-mediated repression requires the formation of a multiprotein repression complex at the ventral silencer.
dc.typeJournal article
pubs.publication-statusPublished

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