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Triple-helix formation is compatible with an adjacent DNA-protein complex
C C Huang1, D Nguyen, R Martinez
1Drug Discovery Systems Research Group, Genelabs Incorporated, Redwood City, California 94063.
Biochemistry
|February 4, 1992
Summary
Triple helix formation adjacent to DNA binding sites does not impede protein interactions. This study shows that UL9 protein binding to herpes simplex virus DNA is compatible with triple helix structures in nearby sequences.
Area of Science:
- Molecular Biology
- Virology
- Biochemistry
Background:
- Protein-DNA interactions are crucial for viral replication.
- Herpes Simplex Virus type 1 (HSV-1) utilizes specific proteins like UL9 for origin binding.
- Oligonucleotide-directed triple helix formation is a method to bind specific DNA sequences.
Purpose of the Study:
- To investigate the effect of triple helix formation on protein binding to adjacent DNA sequences.
- To determine if UL9 protein binding is compatible with triple helix structures.
- To design oligonucleotides for optimal triple helix formation under protein binding conditions.
Main Methods:
- Design of a double-stranded oligonucleotide with adjacent target sites.
- Synthesis of a pyrimidine oligonucleotide to form a triple helix.
- Gel mobility shift assays to detect protein-DNA-oligonucleotide complexes.
Main Results:
- A trimolecular complex of duplex DNA, a third oligonucleotide strand, and UL9 protein was successfully detected.
- Triple helix formation in sequences adjacent to the UL9 recognition site did not prevent UL9 binding.
- The UL9-DNA complex formation is compatible with the presence of an adjacent triple helix.
Conclusions:
- Oligonucleotide-directed triple helix formation does not inhibit the binding of the UL9 protein to its adjacent recognition sequence.
- This finding suggests potential for combined targeting strategies in molecular biology and antiviral research.
- The study demonstrates the feasibility of forming a trimolecular complex under specific conditions.