Work

Thermodynamic Signature of DNA Damage: Characterization of DNA with a 5-Hydroxy-2′-deoxycytidine·2′-Deoxyguanosine Base Pair

Year: 2012

Type: article

Abstract: Oxidation of DNA due to exposure to reactive oxygen species is a major source of DNA damage. One of the oxidation lesions formed, 5-hydroxy-2'-deoxycytidine, has been shown to miscode by some replicative DNA polymerases but not by error prone polymerases capable of translesion synthesis. The 5-hydroxy-2'-deoxycytidine lesion is repaired by DNA glycosylases that require the 5-hydroxycytidine base to be extrahelical so it can enter into the enzyme's active site where it is excised off the DNA backbone to afford an abasic site. The thermodynamic and nuclear magnetic resonance results presented here describe the effect of a 5-hydroxy-2'-deoxycytidine·2'-deoxyguanosine base pair on the stability of two different DNA duplexes. The results demonstrate that the lesion is highly destabilizing and that the energy barrier for the unstacking of 5-hydroxy-2'-deoxycytidine from the DNA duplex may be low. This could provide a thermodynamic mode of adduct identification by DNA glycosylases that requires the lesion to be extrahelical.

Source: Biochemistry

DOI: 10.1021/bi3000269

Authors: Manjori Ganguly, Marta W. Szulik, Patrick S. Donahue, Kate Clancy, Michael P. Stone, Barry Gold

Institutions: University of Pittsburgh, Vanderbilt University

Language: English

Topic: DNA and Nucleic Acid Chemistry

Subfield: Molecular Biology

Field: Biochemistry, Genetics and Molecular Biology

Domain: Life Sciences

Open Access status: green

Funder: National Cancer Institute

Awards: G1108554117, DNA Damage: Roles in Toxicity and Mutagenicity