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- W3200224513 abstract "Ribonucleotide reductase (RNR), which supplies the building blocks for DNA biosynthesis and its repair, has been linked to human diseases and is emerging as a therapeutic target. Here, we present a mechanistic investigation of triapine (3AP), a clinically relevant small molecule that inhibits the tyrosyl radical within the RNR β2 subunit. Solvent kinetic isotope effects reveal that proton transfer is not rate-limiting for inhibition of Y122· of E. coli RNR β2 by the pertinent 3AP-Fe(II) adduct. Vibrational spectroscopy further demonstrates that unlike inhibition of the β2 tyrosyl radical by hydroxyurea, a carboxylate containing proton wire is not at play. Binding measurements reveal a low nanomolar affinity (Kd ∼ 6 nM) of 3AP-Fe(II) for β2. Taken together, these data should prompt further development of RNR inactivators based on the triapine scaffold for therapeutic applications." @default.
- W3200224513 created "2021-09-27" @default.
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- W3200224513 date "2021-09-13" @default.
- W3200224513 modified "2023-09-24" @default.
- W3200224513 title "E. coli Ribonucleotide Reductase β2 Subunit Inactivation by Triapine Occurs through Binding of a Triapine–Fe(II) Adduct" @default.
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- W3200224513 doi "https://doi.org/10.1021/acs.jpclett.1c02103" @default.
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