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Transcriptional regulation by cyclic AMP-responsive factors.
1Institut de Génétique et de Biologie Moléculaire et Cellulaire CNRS-INSERM-Université Louis Pasteur, Illkirch-Strasbourg, France.
Progress in Nucleic Acid Research and Molecular Biology
|March 4, 2000
Summary
Cyclic AMP-responsive nuclear factors regulate gene expression in eukaryotes. These proteins, like CREB, are crucial for processes including spermatogenesis and memory.
Area of Science:
- Molecular Biology
- Cell Signaling
Background:
- Transcriptional regulation in eukaryotes involves cyclic AMP (cAMP)-responsive nuclear factors.
- Key factors include CREB, CREM, and ATF-1, which bind to cAMP-responsive elements (CREs).
Purpose of the Study:
- To elucidate the mechanisms of transcriptional regulation mediated by cAMP-responsive nuclear factors.
- To explore the role of coactivators and cell-specific activation pathways.
Main Methods:
- Analysis of nuclear factor binding to CREs.
- Investigation of protein-protein interactions with coactivators like CBP and p300.
- Examination of phosphorylation-dependent and independent activation mechanisms.
Main Results:
- CRE-binding proteins' activation is modulated by phosphorylation and coactivators (CBP, p300).
- Alternative activation pathways exist, such as ACT in male germ cells.
- The inducible cAMP early repressor (ICER) acts as a repressor, contributing to transient gene expression.
Conclusions:
- CRE-binding proteins are central regulators of cAMP-mediated transcription.
- Diverse mechanisms, including coactivator interaction and cell-specific factors, control their activity.
- These factors are vital for pituitary function, spermatogenesis, circadian rhythms, and memory formation.