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Transcriptional repression mediated by the serum response factor
W H Ernst1, R Janknecht, M A Cahill
1Institut für Molekularbiologie, Medizinische Hochschule Hannover, Germany.
FEBS Letters
|January 2, 1995
Summary
The serum response element (SRE) binding protein SRF represses c-fos gene transcription by sequestering a co-activator. Its phosphorylation status also influences other transcription, revealing a novel regulatory role for SRF.
Area of Science:
- Molecular Biology
- Gene Regulation
- Oncogenes
Background:
- The serum response element (SRE) is crucial for transcriptional repression of the c-fos proto-oncogene.
- The transcription factor SRF is known to interact with SRE.
Purpose of the Study:
- To investigate the mechanism by which SRF influences SRE-dependent transcription.
- To explore the role of SRF phosphorylation in gene regulation.
Main Methods:
- Analysis of SRE-dependent and SRE-independent transcription.
- Investigating the role of specific SRF domains (DNA-binding core, N-terminal repression domain).
- Assessing the impact of SRF phosphorylation status.
Main Results:
- SRF represses SRE-dependent transcription, likely by sequestering a co-activator.
- The DNA-binding core region of SRF is sufficient for SRE-dependent repression.
- Phosphorylation of SRF at casein kinase II sites affects SRE-independent transcription.
Conclusions:
- SRF exhibits a novel, pleiotropic function in regulating cellular transcription.
- SRF's repressive activity on c-fos involves co-activator sequestration.
- Phosphorylation modulates SRF's broader transcriptional influence.