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• W3205787418 endingPage "3261" @default.
• W3205787418 startingPage "3253" @default.
• W3205787418 abstract "Photolyases (PHRs) repair ultraviolet (UV)-induced DNA photoproducts into normal bases. In this study, we measured the conformational changes upon photoactivation and photorepair processes of a PHR and its specific substrates, (6-4)PHR and a pyrimidine(6-4)pyrimidone photoproduct ((6-4)PP), by light-induced difference Fourier transform infrared (FT-IR) spectroscopy. The single-stranded DNA with (6-4)PP (ss(6-4)PP) was used as a substrate and the resultant FT-IR spectra were compared with the previous results on double-stranded DNA with (6-4)PP (ds(6-4)PP). In the excess amount of substrate to the enzyme, different ss(6-4)PP photorepair FT-IR signals were obtained in an illumination time-dependent manner. As reported for ds(6-4)PP, the early stages of the photoreaction involve the changes in the ss(6-4)PP only, while the late stages of the reaction involve the ss(6-4)PP repair-associated changes and dissociation from (6-4)PHR. From these spectra, difference spectra originating from the binding/dissociation spectrum were extracted. The signals of the C═O stretches of (6-4)PP and repaired thymines in the single- and double-stranded DNA were tentatively assigned. The C═O stretches of (6-4)PP were observed at frequencies that reflect single- and double-stranded DNA environments in aqueous solution, reflecting the different hydrogen-bonding environments. The conformational changes of PHR upon binding of ss(6-4)PP and ds(6-4)PP were similar, suggesting that the conformational change is limited to the (6-4)PP binding pocket region. We interpreted that ds(6-4)PP may be bound together without any special mechanism for flipping out." @default.
• W3205787418 created "2021-10-25" @default.
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• W3205787418 date "2021-10-18" @default.
• W3205787418 modified "2023-10-15" @default.
• W3205787418 title "Structural Changes during the Photorepair and Binding Processes of <i>Xenopus</i> (6–4) Photolyase with (6–4) Photoproducts in Single- and Double-Stranded DNA" @default.
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• W3205787418 doi "https://doi.org/10.1021/acs.biochem.1c00413" @default.
• W3205787418 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34658241" @default.
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