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RNase H activation by stereoregular boranophosphate oligonucleotide
Xin Wang1, Mikhail Dobrikov, Dmitri Sergueev
1Department of Chemistry, Duke University, Durham, North Carolina 27708-0346, USA.
Nucleosides, Nucleotides & Nucleic Acids
|October 21, 2003
Summary
A novel stereoregular all-(Sp)-boranophosphate oligodeoxyribonucleotide (BH3(-)-ODN) was synthesized and shown to induce RNA hydrolysis. This BH3(-)-ODN hybridizes with complementary RNA, enabling RNase H degradation at low concentrations.
Area of Science:
- Biochemistry
- Molecular Biology
- Oligonucleotide Chemistry
Background:
- Oligodeoxyribonucleotides (ODNs) are crucial in molecular biology and therapeutics.
- Boron-containing modifications offer unique chemical properties for ODN applications.
- RNase H is an enzyme that degrades RNA in DNA-RNA hybrids.
Purpose of the Study:
- To synthesize a stereoregular all-(Sp)-boranophosphate oligodeoxyribonucleotide (BH3(-)-ODN).
- To evaluate the ability of BH3(-)-ODN to form hybrids with complementary RNA.
- To assess the efficiency of BH3(-)-ODN in inducing RNase H-mediated RNA hydrolysis.
Main Methods:
- Enzymatic synthesis of a 15-mer BH3(-)-ODN.
- Formation of a DNA-RNA hybrid with a complementary 15-mer RNA.
- Incubation at 37°C to induce RNase H hydrolysis.
Main Results:
- Successful synthesis of the stereoregular all-(Sp)-BH3(-)-ODN.
- BH3(-)-ODN formed a stable hybrid with the complementary RNA strand.
- Induced RNase H hydrolysis of the RNA strand at concentrations as low as 10 nM.
- Demonstrated lower hydrolysis efficiency compared to natural phosphodiester analogues.
Conclusions:
- Stereoregular all-(Sp)-boranophosphate oligodeoxyribonucleotides are synthetically accessible.
- BH3(-)-ODN can effectively induce RNA hydrolysis via RNase H.
- Further optimization may be needed to match the efficiency of natural ODNs.