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• W1993320708 abstract "Temperature-dependent magnetic circular dichroism (MCD) spectroscopy has been used for the first time to probe the electronic structure of the Mo active site in sulfite oxidase (SO). The enzyme was poised in the catalytically relevant [Mo(V):Fe(II)] state by anaerobic reduction of the enzyme with the natural substrate, sulfite, in the absence of the physiological oxidant cytochrome c. The [Mo(V):Fe(II)] state is of particular importance, as it is proposed to be a catalytic intermediate in the oxidative half reaction, where SO is reoxidized to the resting [Mo(VI):Fe(III)] state by two sequential one-electron transfers to cytochrome c. The MCD spectrum of the enzyme shows no charge transfer transitions below ∼17 000 cm−1. This has been interpreted to result from (1) a severe reduction in ene-1,2-dithiolate sulfur in-plane and out-of-plane p orbital mixing, (2) a decrease in the dithiolate sulfur out-of-plane p-Mo dxy orbital overlap, and (3) an orthogonal orientation between the vertical cysteine sulfur p (perpendicular to the Mo–Scys σ-bond) and Mo dxy orbitals. The spectroscopically determined cysteine sulfur p-Mo dxy bonding scheme in the [Mo(V):Fe(II)] state is consistent with the crystallographically determined O–Mo–Scys–C dihedral angle of ∼90° and precludes a covalent interaction between the vertical cysteine sulfur p orbital and Mo dxy, effectively decoupling the cysteine from an effective through-bond electron transfer pathway. We have tentatively assigned a 22 250 cm−1 positive C-term feature in the MCD as the cysteine S(σ)→Mo dxy charge transfer that becomes allowed by a combination of configuration interaction and low-symmetry; however, the orbital overlap is anticipated to be quite small due to the near orthogonality of these orbitals. Therefore, we propose that the primary role of the coordinated cysteine is to decrease the effective nuclear charge on Mo by charge donation to the metal, statically poising the active site at more negative reduction potentials during electron transfer (ET) regeneration. Finally, the results of this study are consistent with the pyranopterin ene-1,2-dithiolate acting to couple the Mo site into efficient superexchange pathways for ET regeneration following oxygen atom transfer to the substrate." @default.
• W1993320708 created "2016-06-24" @default.
• W1993320708 creator A5050020289 @default.
• W1993320708 date "2000-07-01" @default.
• W1993320708 modified "2023-10-03" @default.
• W1993320708 title "An MCD spectroscopic study of the molybdenum active site in sulfite oxidase: insight into the role of coordinated cysteine" @default.
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• W1993320708 doi "https://doi.org/10.1016/s0162-0134(00)00082-9" @default.
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