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Site-Specific Scissors Based on Myeloperoxidase for Phosphorothioate DNA
Zhian Hu1, Jinlei Yang1, Fujian Xu2
1Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China.
Journal of the American Chemical Society
|July 29, 2021
Summary
Researchers discovered a new method for site-specific DNA cleavage using myeloperoxidase (MPO). This endogenous strategy activates DNA devices and enables imaging of oxidative stress in living cells.
Area of Science:
- Biochemistry
- Molecular Biology
- Chemical Biology
Background:
- Site-specific nucleic acid cleavage is crucial for DNA device development.
- Current methods often rely on external triggers, limiting intracellular applications.
- Endogenous strategies are needed for studying cellular processes and signaling networks.
Purpose of the Study:
- To develop an endogenous, site-specific DNA cleavage tool.
- To investigate the mechanism of myeloperoxidase (MPO) in cleaving phosphorothioate (PT)-modified DNA.
- To demonstrate the application of this tool in activating DNA machines and imaging intracellular oxidative stress.
Main Methods:
- Utilized myeloperoxidase (MPO) for site-specific cleavage of phosphorothioate (PT)-modified DNA.
- Elucidated a scissors-like cleavage mechanism involving chloride oxidation.
- Applied the MPO-mediated cleavage to activate PT-modified hairpin-DNA machines for DNAzyme production and hybridization chain reaction (HCR) amplification.
Main Results:
- Accurate site-specific cleavage of PT-modified DNA by MPO was achieved.
- A mechanism involving MPO-mediated chloride oxidation was revealed.
- Activated DNA machines successfully produced HRP-mimicking DNAzyme and initiated HCR amplification.
- HCR amplification enabled robust imaging of oxidative stress in living cells.
Conclusions:
- An accurate and endogenous site-specific DNA cleavage tool using MPO has been developed.
- This tool enables the activation of DNA molecular devices and the study of intracellular biostimuli.
- The system allows for robust imaging of oxidative stress in living cells, highlighting its potential in biological research.
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