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A murine ATFa-associated factor with transcriptional repressing activity
F De Graeve1, A Bahr, B Chatton
1Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/ULP, Illkirch, Communauté Urbaine de Strasbourg, France.
Oncogene
|April 25, 2000
Summary
Researchers discovered a new protein, mouse ATFa-associated Modulator (mAM), that fine-tunes gene expression regulated by ATFa transcription factors. mAM interacts with basal transcription machinery to modulate ATFa activity.
Area of Science:
- Molecular Biology
- Gene Regulation
- Protein Interactions
Background:
- ATFa proteins, part of the CREB/ATF family, interact with adenovirus E1a and Jun/Fos transcription factors.
- ATFa proteins bind JNK2, a stress-induced protein kinase.
Purpose of the Study:
- Identify and characterize novel proteins interacting with ATFa.
- Investigate the role of the novel protein in transcriptional regulation.
Main Methods:
- Yeast two-hybrid screening using ATFa N-terminal domain.
- Protein characterization including sequence analysis, colocalization, and interaction studies in mammalian cells.
- Transfection experiments to assess transcriptional activity and ATPase function.
Main Results:
- Identified and characterized a novel 1306-residue protein, mouse ATFa-associated Modulator (mAM).
- mAM colocalizes and interacts with ATFa, possesses ATPase activity, and contains a nuclear localization signal.
- mAM downregulates transcriptional activity independently of its ATPase function and interacts with basal transcription machinery components (TFIIE, TFIIH, RNAPII).
Conclusions:
- mAM is a novel ATFa-interacting protein involved in regulating gene expression.
- mAM may fine-tune ATFa-regulated gene expression by affecting preinitiation transcription complex assembly or stability.
- The findings suggest a new mechanism for modulating transcription factor activity through protein-protein interactions within the basal transcription machinery.