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The basic helix-loop-helix factor, HAND2, functions as a transcriptional activator by binding to E-boxes as a
1Department of Anatomy and Cell Biology, Columbia University, New York, NY 10032, USA.
The Journal of Biological Chemistry
|January 29, 2002
Summary
HAND2, a transcription factor crucial for development, acts as an activator by binding DNA with E-proteins. This study details HAND2
Area of Science:
- Developmental Biology
- Molecular Biology
- Genetics
Background:
- HAND2 (dHAND) is a basic helix-loop-helix (bHLH) transcription factor vital for embryonic development.
- It plays roles in the heart, limbs, vasculature, and nervous system, but its regulatory mechanisms are poorly understood.
Purpose of the Study:
- To elucidate the transcriptional regulatory mechanisms of HAND2.
- To understand how HAND2 interacts with other proteins to regulate gene expression.
Main Methods:
- Mammalian one-hybrid analysis to identify transcriptional activation domains.
- Yeast and mammalian two-hybrid assays to study protein-protein interactions.
- DNA binding site determination.
Main Results:
- HAND2 possesses a strong transcriptional activation domain in its amino-terminal region.
- HAND2 primarily heterodimerizes with E-proteins, not homodimerizes, in mammalian cells.
- The consensus DNA binding site for HAND2 was identified, showing binding to a subset of E-boxes as a HAND2/E12 heterodimer.
Conclusions:
- HAND2 functions as a transcription activator.
- Its activity relies on heterodimerization with E-proteins to bind specific DNA sequences (E-boxes).
- This mechanism is critical for HAND2's role in tissue development.