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Max and c-Myc/Max DNA-binding activities in cell extracts.
T D Littlewood1, B Amati, H Land
1Biochemistry of the Cell Nucleus Laboratory, Imperial Cancer Research Fund, London, UK.
Oncogene
|September 1, 1992
Summary
The c-Myc oncoprotein requires its partner Max to bind DNA. Max alone can bind DNA, but c-Myc only binds DNA when complexed with Max, suggesting an obligate partnership.
Area of Science:
- Molecular biology
- Oncology
- Protein-protein interactions
Background:
- The c-Myc oncoprotein is a key regulator of cell growth and proliferation.
- Dysregulation of c-Myc is implicated in numerous cancers.
- Understanding c-Myc's DNA-binding mechanism is crucial for cancer research.
Purpose of the Study:
- To investigate the interaction between c-Myc and its partner Max.
- To determine the DNA-binding capabilities of c-Myc and Max, individually and as a complex.
- To elucidate the role of Max in mediating c-Myc's DNA binding.
Main Methods:
- Analysis of protein interactions in cell extracts.
- In vitro translation of c-Myc and Max proteins.
- DNA-binding assays using purified proteins and cell extracts.
Main Results:
- c-Myc predominantly exists as a heterodimer with Max in cell extracts.
- Both Max alone and the c-Myc/Max complex bind to the same specific DNA sequence.
- c-Myc alone does not bind the target DNA sequence; Max is essential for this binding.
Conclusions:
- c-Myc's DNA-binding activity is dependent on its heterodimerization with Max.
- Max acts as an essential partner, enabling c-Myc to bind its target DNA sequence.
- This obligate complex formation suggests a critical regulatory mechanism for c-Myc function.