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Cellular factors that interact with the hepatitis B virus enhancer
R Ben-Levy1, O Faktor, I Berger
1Department of Virology, Weizmann Institute of Science, Rehovot, Israel.
Molecular and Cellular Biology
|April 1, 1989
Summary
Hepatitis B virus DNA activates gene transcription by interacting with cellular factors. These factors and their binding sites are conserved across hepadnaviruses, suggesting shared regulatory mechanisms.
Area of Science:
- Molecular Biology
- Virology
- Gene Regulation
Background:
- Hepatitis B virus (HBV) is a significant human pathogen.
- Understanding viral gene regulation is crucial for developing antiviral strategies.
Purpose of the Study:
- To investigate the transcriptional activation potential of HBV DNA fragments.
- To identify cellular factors that bind to HBV regulatory elements.
- To explore the conservation of these elements within the hepadnavirus family.
Main Methods:
- Analysis of an 83-base-pair HBV DNA fragment.
- Assessing the fragment's ability to activate a heterologous globin gene promoter.
- Identifying cellular factor binding sites within the HBV DNA fragment.
Main Results:
- An 83-bp HBV DNA fragment strongly activated transcription of the globin gene promoter.
- This fragment contained binding sites for at least four cellular factors: E, TGT3, EP, and NF-I.
- Factor E is a positive regulator responsive to phorbol ester; EP is identical to EF-C, a polyomavirus enhancer-binding factor.
Conclusions:
- HBV utilizes specific DNA sequences to enhance gene transcription.
- Cellular factors E, TGT3, EP (EF-C), and NF-I are involved in regulating HBV transcription.
- Conserved binding site sequences suggest shared enhancer elements across hepadnaviruses.