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- W1983228639 abstract "The Escherichia coli DNA repair proteins UvrA, UvrB and UvrC work together to recognize and incise DNA damage during the process of nucleotide excision repair (NER). To gain an understanding of the damage recognition properties of UvrA, we have used fluorescence spectroscopy to study the thermodynamics of its interaction with a defined DNA substrate containing a benzo[a]pyrene diol epoxide (BPDE) adduct. Oligonucleotides containing a single site-specifically modified N2-guanine (+)-trans-, (−)-trans-, (+)-cis-, or (−)-cis-BPDE adducts were ligated into 50-base-pair DNA fragments. All four stereoisomers of DNA-BPDE adducts show an excitation maximum at 350 nm and an emission maximum around 380 to 385 nm. Binding of UvrA to the BPDE-DNA adducts results in a five to sevenfold fluorescence enhancement. Titration of the BPDE-adducted DNA with UvrA was used to generate binding isotherms. The equilibrium dissociation constants for UvrA binding to (+)-trans-, (−)-trans-, (+)-cis-, and (−)-cis- BPDE adduct were: 7.4 ± 1.9, 15.8 ± 5.4, 11.3 ± 2.7 and 22.4 ± 2.0 nM, respectively. There was a large negative change in heat capacity ΔCp,obso, (−3.3 kcal mol−1 K−1) accompanied by a relatively unchanged ΔGobso with temperature. Furthermore, varying the concentration of KCl showed that the number of ions released upon formation of UvrA-DNA complex is about 3.4, a relatively small value compared to the contact size of UvrA with the substrate. These data suggest that hydrophobic interactions are an important driving force for UvrA binding to BPDE-damaged DNA." @default.
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- W1983228639 date "1987-11-01" @default.
- W1983228639 modified "2023-09-25" @default.
- W1983228639 title "Reactivity of antibodies to DNA modified by benzo(a)pyrene is dependent on the level of modification — implications for quantitation of benzo(a)pyrene-DNA adducts" @default.
- W1983228639 doi "https://doi.org/10.1016/0277-5379(87)90754-1" @default.
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