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• W2000898535 endingPage "1091" @default.
• W2000898535 startingPage "1078" @default.
• W2000898535 abstract "The active sites of the (6-4) photolyases contain two conserved histidine residues, which, in the Drosophila melanogaster enzyme, correspond to His365 and His369. While there are nine combinations in which the three possible protonation states of the two histidines (with protons on Nδ (HID), Nε (HIE), or both Nδ and Nε (HIP)) can be paired, there is presently no consensus as to which of these states is present, let alone mechanistically relevant. EPR hyperfine couplings for selected protons of the FADH(•) radical have previously been used to address this issue. Our QM/MM calculations show, however, that the experimental couplings are equally well reproduced by each of the nine combinations. Since the EPR results seemingly cannot be used to unequivocally assign the protonation states, the pKa values of the two histidines were calculated using the popular PROPKA, H++, and APBS approaches, in various environments and for several lesions. These techniques consistently indicate that, at pH = 7, both His365 and His369 should be neutral, although His369 is found to be more prone to becoming protonated. In a comparative approach, a series of molecular dynamics simulations was performed with all nine combinations, employing various reference crystal structures and different oxidation states of the FAD cofactor. The overall result of this approach is in agreement with our pKa results. Consequently, although the introduction of the reduced cofactor results in an increased stability for selected protonated states, particularly the His365═HID and His369═HIP combination, the neutral combination His365═HID and His365═HIE stands out as the most relevant state for the activity of the enzyme." @default.
• W2000898535 created "2016-06-24" @default.
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• W2000898535 date "2012-02-09" @default.
• W2000898535 modified "2023-10-16" @default.
• W2000898535 title "The Protonation States of the Active-Site Histidines in (6–4) Photolyase" @default.
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• W2000898535 doi "https://doi.org/10.1021/ct2005648" @default.
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