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HBV C promoter Sp1 binding sequence functionally substitutes for the yeast ARS1 ABF1 binding site
Peijun Yan1, Xicheng Mao, Lei Wang
1Department of Biochemistry and Molecular Biology, Shanghai Medical College, Fudan University, Shanghai 200032, China.
DNA and Cell Biology
|November 22, 2002
Summary
Yeast RAP1 protein binds to hepatitis B virus (HBV) Sp1 binding sites, activating transcription and stimulating yeast DNA replication. This suggests viral sequences can influence host DNA replication processes.
Area of Science:
- Molecular Biology
- Virology
- Yeast Genetics
Background:
- Transcriptional factors play a role in eukaryotic DNA replication.
- The hepatitis B virus (HBV) pregenomic promoter is regulated by enhancers and cis-elements.
- A specific G-C rich region (1734-1754 nt) with SP1 binding sites is crucial for HBV transcription origin and replication.
Purpose of the Study:
- To investigate the function of a viral promoter sequence in DNA replication.
- To determine if viral Sp1 binding sites can functionally replace yeast elements in DNA replication.
- To explore the interaction of yeast proteins with viral DNA sequences.
Main Methods:
- Functional replacement assays using yeast ARS1 and viral Sp1-binding sequences.
- In vitro binding assays to assess protein-DNA interactions.
- Analysis of transcriptional activation from the HBV C promoter.
Main Results:
- The viral Sp1-binding DNA sequence functionally replaced the yeast Abf1-binding B3 element in ARS1.
- The viral Sp1-binding sequence activated transcription from the HBV C promoter.
- Yeast RAP1 protein was found to bind to the viral Sp1 binding sites in vitro.
Conclusions:
- Yeast RAP1 binds to Sp1 binding sites within the HBV promoter sequence.
- This binding event stimulates yeast DNA replication, indicating a role for viral elements in host replication.
- The findings suggest a conserved mechanism or cross-talk between viral and host DNA replication machinery.