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Multiprotein complex formation on the c-myc promoter

T J Logan¹, K H Moberg, D J Hall

¹Dept of Biochemistry and Molecular Pharmacology, Thomas Jefferson University, Philadelphia, PA 19107, USA.

Biochemistry and Molecular Biology International

|January 7, 1998

Summary

This study reveals how E2F transcription factor binds to the c-myc gene promoter. It forms distinct complexes with pRb or cyclin A, influencing gene activation.

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Area of Science:

Molecular Biology
Oncology
Gene Regulation

Background:

The c-myc proto-oncogene is crucial for cell growth and is often dysregulated in cancer.
The E2F transcription factor binding site within the c-myc P2 promoter is essential for optimal gene transcription.
The specific protein complexes formed at this E2F site remain incompletely understood.

Purpose of the Study:

To characterize the multiprotein complexes that bind to the E2F element of the c-myc P2 promoter.
To investigate the different forms of E2F transcription factor binding and their cellular localization.
To elucidate the role of these complexes in transcriptional activation of the c-myc gene.

Main Methods:

Analysis of protein extracts from human glioblastoma cells and NIH3T3 fibroblasts.
Electrophoretic mobility shift assays (EMSAs) to detect transcription factor binding.
Fractionation of cellular extracts to determine the subcellular localization of protein complexes.

Main Results:

Significant binding of E2F transcription factor to the c-myc E2F site was observed.
E2F binding occurred as a monomer (active form) and in two mutually exclusive complexes: one with the retinoblastoma gene product (pRb) and another with cyclin A.
The E2F monomer was primarily found in the cytosolic fraction, while the pRb and cyclin A complexes were predominantly nuclear.
These findings suggest novel physical properties of the E2F monomer.

Conclusions:

Protein complex formation at the c-myc E2F site is a key mechanism for transcriptional activation.
The distinct complexes involving E2F, pRb, and cyclin A contribute uniquely to regulating c-myc expression.
Understanding these interactions provides insights into the molecular mechanisms of proto-oncogene regulation.

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