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• W2888592013 endingPage "11810" @default.
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• W2888592013 abstract "Here we characterize the [Fe4S4] cluster nitrosylation of a DNA repair enzyme, endonuclease III (EndoIII), using DNA-modified gold electrochemistry and protein film voltammetry, electrophoretic mobility shift assays, mass spectrometry of whole and trypsin-digested protein, and a variety of spectroscopies. Exposure of EndoIII to nitric oxide under anaerobic conditions transforms the [Fe4S4] cluster into a dinitrosyl iron complex, [(Cys)2Fe(NO)2]-, and Roussin's red ester, [(μ-Cys)2Fe2(NO)4], in a 1:1 ratio with an average retention of 3.05 ± 0.01 Fe per nitrosylated cluster. The formation of the dinitrosyl iron complex is consistent with previous reports, but the Roussin's red ester is an unreported product of EndoIII nitrosylation. Hyperfine sublevel correlation (HYSCORE) pulse EPR spectroscopy detects two distinct classes of NO with 14N hyperfine couplings consistent with the dinitrosyl iron complex and reduced Roussin's red ester. Whole-protein mass spectrometry of EndoIII nitrosylated with 14NO and 15NO support the assignment of a protein-bound [(μ-Cys)2Fe2(NO)4] Roussin's red ester. The [Fe4S4]2+/3+ redox couple of DNA-bound EndoIII is observable using DNA-modified gold electrochemistry, but nitrosylated EndoIII does not display observable redox activity using DNA electrochemistry on gold despite having a similar DNA-binding affinity as the native protein. However, direct electrochemistry of protein films on graphite reveals the reduction potential of native and nitrosylated EndoIII to be 127 ± 6 and -674 ± 8 mV vs NHE, respectively, corresponding to a shift of approximately -800 mV with cluster nitrosylation. Collectively, these data demonstrate that DNA-bound redox activity, and by extension DNA-mediated charge transport, is modulated by [Fe4S4] cluster nitrosylation." @default.
• W2888592013 created "2018-08-31" @default.
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• W2888592013 date "2018-08-26" @default.
• W2888592013 modified "2023-10-18" @default.
• W2888592013 title "Nitric Oxide Modulates Endonuclease III Redox Activity by a 800 mV Negative Shift upon [Fe₄S₄] Cluster Nitrosylation" @default.
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• W2888592013 doi "https://doi.org/10.1021/jacs.8b07362" @default.
• W2888592013 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6186442" @default.
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