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• W1991189413 endingPage "18204" @default.
• W1991189413 startingPage "18191" @default.
• W1991189413 abstract "The diastereomeric spiroiminodihydantoin-2'-deoxyribonucleoside (dSp) lesions resulting from 2'-deoxyguanosine (dG) or 8-oxo-7,8-dihydro-2'-deoxyguanosine (dOG) oxidation have generated much attention due to their highly mutagenic nature. Their propeller-like shape leads these molecules to display mutational profiles in vivo that are stereochemically dependent. However, there exist conflicting absolute configuration assignments arising from electronic circular dichroism (ECD) and NOESY-NMR experiments; thus, providing definitive assignments of the 3D structure of these molecules is of great interest. In the present body of work, we present data inconsistent with the reported ECD assignments for the dSp diastereomers in the nucleoside context, in which the first eluting isomer from a Hypercarb HPLC column was assigned to be the S configuration, and the second was assigned the R configuration. The following experiments were conducted: (1) determination of the diastereomer ratio of dSp products upon one-electron oxidation of dG in chiral hybrid or propeller G-quadruplexes that expose the re or si face to solvent, respectively; (2) absolute configuration analysis using vibrational circular dichroism (VCD) spectroscopy; (3) reinterpretation of the ECD experimental spectra using time-dependent density functional theory (TDDFT) with the inclusion of 12 explicit H-bonding waters around the Sp free bases; and (4) reevaluation of calculated specific rotations for the Sp enantiomers using the hydration model in the TDDFT calculations. These new insights provide a fresh look at the absolute configuration assignments of the dSp diastereomers in which the first eluting from a Hypercarb-HPLC column is (-)-(R)-dSp and the second is (+)-(S)-dSp. These assignments now provide the basis for understanding the biological significance of the stereochemical dependence of enzymes that process this form of DNA damage." @default.
• W1991189413 created "2016-06-24" @default.
• W1991189413 creator A5003239051 @default.
• W1991189413 creator A5005659666 @default.
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• W1991189413 creator A5041710247 @default.
• W1991189413 creator A5045985355 @default.
• W1991189413 creator A5089320688 @default.
• W1991189413 date "2013-11-21" @default.
• W1991189413 modified "2023-10-16" @default.
• W1991189413 title "Reconciliation of Chemical, Enzymatic, Spectroscopic and Computational Data To Assign the Absolute Configuration of the DNA Base Lesion Spiroiminodihydantoin" @default.
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