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Triplex-forming oligonucleotides trigger conformation changes of a target hairpin sequence
E Brossalina1, E Demchenko, Y Demchenko
1Institute of Bioorganic Chemistry, Siberian Division of Russian Academy of Sciences, Novosibirsk, Russia.
Nucleic Acids Research
|September 1, 1996
Summary
Oligonucleotides can alter DNA structures, acting as "structural switchers." This study shows how specific DNA sequences can modulate BamHI enzyme activity, offering a new way to control gene expression.
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- DNA duplexes and hairpin structures are fundamental in molecular biology.
- Restriction enzymes like BamHI play crucial roles in DNA manipulation and gene regulation.
- Oligonucleotides can interact with DNA, influencing its structure and function.
Purpose of the Study:
- To investigate how triplex-forming oligonucleotides modulate the activity of the restriction enzyme BamHI on a specific DNA substrate.
- To explore the potential of oligonucleotides as regulators of DNA conformation and enzyme activity for gene expression control.
Main Methods:
- Utilized a DNA substrate (69T-OL7 duplex) and complementary oligodeoxypyrimidines (OL1, OL5, OL2).
- Assessed BamHI enzyme activity in the presence of these oligonucleotides.
- Employed footprinting assays and point-mutated oligonucleotides to determine conformational changes.
Main Results:
- Oligonucleotides OL1, OL5, and OL2 significantly altered BamHI activity on the 69T-OL7 substrate.
- OL1 abolished BamHI cleavage, while OL5 and OL2 strongly increased it.
- These modulations were attributed to distinct DNA complex conformations induced by oligonucleotide binding.
Conclusions:
- Oligonucleotides can function as structural switchers, altering DNA conformation.
- This conformational modulation provides a novel mechanism for controlling enzyme activity and gene expression.