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Yeast ribonuclease H(70) cleaves RNA-DNA junctions
FEBS Letters
|October 6, 1986
Summary
Researchers studied enzymes with RNase H activity using a synthesized M13 DNA:RNA-[32P]DNA substrate. Saccharomyces cerevisiae RNase H(70) was found to cleave the phosphodiester bond at the RNA-DNA junction.
Area of Science:
- Biochemistry
- Molecular Biology
- Enzymology
Background:
- RNase H enzymes play a crucial role in nucleic acid metabolism.
- Understanding the specific cleavage mechanisms of RNase H is essential for various biotechnological applications.
Purpose of the Study:
- To elucidate the precise mode of cleavage by enzymes exhibiting RNase H activity.
- To characterize the reaction mechanism of RNase H(70) from Saccharomyces cerevisiae.
Main Methods:
- Synthesis of a specific M13 DNA:RNA-[32P]DNA substrate.
- Enzymatic assays using purified RNase H(70) from Saccharomyces cerevisiae.
Main Results:
- The synthesized M13 DNA:RNA-[32P]DNA substrate was effectively utilized to study enzyme activity.
- RNase H(70) from Saccharomyces cerevisiae was confirmed to hydrolyze the phosphodiester bond specifically at the RNA-DNA junction.
- Cleavage resulted in the formation of a 5'-monophosphate-terminated polydeoxyribonucleotide and 3'-hydroxyl-terminated oligoribonucleotides.
Conclusions:
- The study provides detailed insight into the cleavage specificity of RNase H enzymes.
- RNase H(70) from Saccharomyces cerevisiae acts as an endonuclease at the RNA-DNA hybrid interface.