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Sequence-specific transcriptional activation by Myc and repression by Max
1Ben May Institute, University of Chicago, Illinois 60637.
Molecular and Cellular Biology
|January 1, 1993
Summary
The c-Myc protein activates transcription in cells, but its partner, Max, represses it. Their opposing actions, regulated by cellular levels, suggest a functional antagonism in vivo.
Area of Science:
- Molecular Biology
- Oncogenesis
- Gene Regulation
Background:
- The c-Myc oncoprotein is crucial for cell proliferation.
- The in vivo mechanism of c-Myc's action remains unclear.
- The identification of Myc's DNA-binding site and its partner Max facilitates functional studies.
Purpose of the Study:
- To elucidate the in vivo function of c-Myc.
- To investigate how Max modulates c-Myc's transcriptional activity.
- To understand the functional relationship between Myc and Max.
Main Methods:
- Exogenous expression of Myc and Max in vivo.
- Analysis of transcriptional activation and repression.
- Assessment of protein domains critical for Myc function.
Main Results:
- Exogenously expressed Myc activates transcription via its specific DNA-binding site.
- Myc-mediated transcriptional activation depends on its basic region and dimerization motifs.
- Exogenously expressed Max represses transcription and blocks Myc-mediated activation at the same DNA-binding site.
Conclusions:
- A functional antagonism exists between Myc and Max.
- The relative cellular levels of Myc and Max mediate their opposing effects.
- A model for Myc and Max activity in vivo is proposed.