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PMID: 8248254 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S.

Selective repression of transcriptional activators at a distance by the Drosophila Krüppel protein.

Licht JD, Ro M, English MA, Grossel M, Hansen U

Abstract

The Krüppel (Kr) protein, bound at kilobase distances from the start site of transcription, represses transcription by RNA polymerase II in mammalian cells. Repression is monotonically dependent on the dose of Kr protein and the presence of Kr binding site(s) on the DNA. These data suggest an inhibitory protein-protein interaction between the Kr protein and proximal transcription factors. Repression by Kr depends on the specific activator protein driving transcription. In particular, Kr protein selectively represses transcription mediated by the Sp1 glutamine-rich activation domain, tethered to the promoter by a GAL4 DNA-binding domain, but does not repress transcription stimulated by the acidic GAL4 activator. We believe this represents repression by a quenching interaction between DNA-bound Kr protein and the activation region of Sp1, rather than competition between Sp1 and Kr for a limiting transcriptional component. Selective, context-related repression affords an added layer of combinatorial control of gene expression by sequence-specific transcription factors.

Related Genes
Kr
MeSH Terms
Animals Cell Line Chlorocebus aethiops DNA-Binding Proteins/physiology Drosophila Proteins Drosophila melanogaster/genetics Gene Expression Regulation Glutamine/chemistry In Vitro Techniques Kruppel-Like Transcription Factors Promoter Regions, Genetic RNA, Messenger/genetics Repressor Proteins/physiology Structure-Activity Relationship Trans-Activators/antagonists & inhibitors,chemistry Transcription Factors/physiology Transcriptional Activation
Chemicals
DNA-Binding Proteins Drosophila Proteins Kr protein, Drosophila Kruppel-Like Transcription Factors RNA, Messenger Repressor Proteins Trans-Activators Transcription Factors Glutamine
Authors & Affiliations
5 authors, click to expand affiliations / ORCID
Licht J D
Laboratory of Eukaryotic Transcription, Dana-Farber Cancer Institute, Boston, MA.
Ro M
English M A
Grossel M
Hansen U
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Article Info
Journal
Proceedings of the National Academy of Sciences of the United States of America
Abbr.
Proc Natl Acad Sci U S A
ISSN
0027-8424
Published
1993-12-01
Pages
11361-5
Language
English
Region
United States
NLM ID
7505876
PMCID
PMC47982
Subset
IM
Grants
NCI NIH HHS · K11CA01272 · United States
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