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Oxidative DNA strand scission induced by peptides
Erin G Prestwich1, Marc D Roy, Jennifer Rego
1Merkert Chemistry Center, Boston College, Chestnut Hill, MA 02467, USA.
Chemistry & Biology
|June 25, 2005
Summary
Reactive oxygen species cause cellular damage by degrading biomolecules. New findings show they also convert protein residues into peroxides, leading to DNA backbone cleavage and strand scission.
Area of Science:
- Biochemistry
- Molecular Biology
- Cellular Biology
Background:
- Cellular oxidative stress leads to damage of DNA, proteins, and membranes.
- Reactive oxygen species (ROS) are key mediators of oxidative stress.
- ROS can directly degrade biomolecules like polypeptides and polynucleotides.
Purpose of the Study:
- To investigate the mechanisms by which reactive oxygen species induce cellular damage.
- To explore the role of protein modifications in ROS-mediated DNA damage.
- To determine if ROS can promote cross-reactivity between proteins and DNA.
Main Methods:
- Experimental analysis of reactive oxygen species interactions with proteins and DNA.
- Oxidation of various protein residues to assess their effect on DNA.
- Investigation of DNA backbone cleavage mechanisms.
Main Results:
- Reactive oxygen species convert protein residues into peroxides.
- These peroxides promote cross-reactivity, leading to DNA backbone cleavage.
- Oxidation of diverse amino acid residues induces DNA strand scission.
- Hydrogen abstraction at the DNA backbone is identified as the primary damage mechanism.
Conclusions:
- Reactive oxygen species contribute to cellular toxicity through direct degradation and indirect cross-reactivity.
- Protein-mediated DNA damage by ROS is a significant toxic mechanism.
- Cross-reactions within protein/DNA complexes are crucial factors in oxidative stress toxicity.