title: Thermodynamic signature of DNA damage: characterization of DNA with a 5-hydroxy-2'-deoxycytidine·2'-deoxyguanosine base pair.
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.
authors.affiliation: Department of Pharmaceutical Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States.
authors.forename: Manjori
authors.initials: M
authors.lastname: Ganguly
authors.forename: Marta W
authors.initials: MW
authors.lastname: Szulik
authors.forename: Patrick S
authors.initials: PS
authors.lastname: Donahue
authors.forename: Kate
authors.initials: K
authors.lastname: Clancy
authors.forename: Michael P
authors.initials: MP
authors.lastname: Stone
authors.forename: Barry
authors.initials: B
authors.lastname: Gold
mesh_terms: D001665:Binding Sites; D002942:Circular Dichroism; D004249:DNA Damage; D045647:DNA Glycosylases / Q000737:chemistry / Q000378:metabolism; D004260:DNA Repair; D003841:Deoxycytidine / Q000031:analogs & derivatives* / Q000737:chemistry / Q000378:metabolism; D003849:Deoxyguanosine / Q000737:chemistry* / Q000378:metabolism; D019906:Nuclear Magnetic Resonance, Biomolecular; D009690:Nucleic Acid Conformation; D013816:Thermodynamics
chemical_list: D003841:Deoxycytidine; C074071:5-hydroxy-2'-deoxycytidine; D045647:DNA Glycosylases; D003849:Deoxyguanosine