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UvrABC nuclease complex repairs thymine glycol, an oxidative DNA base damage
Y W Kow1, S S Wallace, B Van Houten
1Department of Microbiology and Molecular Genetics, University of Vermont, Burlington 05405.
Mutation Research
|March 1, 1990
Summary
The UvrABC nuclease complex repairs oxidative DNA damage, including thymine glycol lesions. This nucleotide excision repair pathway is active in vivo and dependent on UvrABC levels.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- The UvrABC nuclease complex is a key component of DNA repair.
- It recognizes various DNA lesions, including pyrimidine dimers and chemical adducts.
Purpose of the Study:
- To investigate the substrate specificity of the UvrABC complex.
- To determine if UvrABC repairs oxidative DNA lesions like thymine glycol.
Main Methods:
- In vitro incision assays using PM2 DNA with specific lesions.
- In vivo repair studies using phi X-174 RF DNA in E. coli.
- Assessing repair levels in relation to UvrABC complex concentration.
Main Results:
- UvrABC incised DNA containing thymine glycol but not dihydrothymine.
- The complex also incised DNA with reduced apurinic sites and O-alkyl hydroxylamine adducts.
- Nucleotide excision repair of thymine glycol in vivo was dependent on UvrABC levels.
Conclusions:
- UvrABC-mediated nucleotide excision repair plays a role in repairing oxidative DNA damage, specifically thymine glycol.
- This pathway is important for lesions formed by ionizing radiation or oxidative stress.
- UvrABC shows specificity for certain DNA lesions, distinguishing between similar structures.