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Assignment of protonated R-homocitrate in extracted FeMo-cofactor of nitrogenase via vibrational circular dichroism spectroscopies.


ABSTRACT: Protonation of FeMo-cofactor is important for the process of substrate hydrogenation. Its structure has been clarified as Δ-Mo*Fe7S9C(R-homocit*)(cys)(Hhis) for the efforts of nearly 30 years, while it remains controversial whether FeMo-cofactor is protonated or deprotonated with chelated ≡C-O(H) homocitrate. We have used protonated molybdenum(V) lactates 1 and its enantiomer as model compounds for R-homocitrate in FeMo-cofactor of nitrogenase. Vibrational circular dichroism (VCD) spectrum of 1 at 1051 cm-1 is attributed to ≡C-OH vibration, and molybdenum(VI) R-lactate at 1086 cm-1 is assigned as ≡C-O α-alkoxy vibration. These vibrations set up labels for the protonation state of coordinated α-hydroxycarboxylates. The characteristic VCD band of NMF-extracted FeMo-cofactor is assigned to ν(C-OH), which is based on the comparison of molybdenum(VI) R-homocitrate. Density Functional Theory calculations are in consistent with these assignments. To the best of our knowledge, this is the first time that protonated R-homocitrate in FeMo-cofactor is confirmed by VCD spectra.

SUBMITTER: Deng L 

PROVIDER: S-EPMC8323615 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature

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Assignment of protonated <i>R</i>-homocitrate in extracted FeMo-cofactor of nitrogenase <i>via</i> vibrational circular dichroism spectroscopies.

Deng Lan L   Wang Hongxin H   Dapper Christie H CH   Newton William E WE   Shilov Sergey S   Wang Shunlin S   Cramer Stephen P SP   Zhou Zhao-Hui ZH  

Communications chemistry 20201028


Protonation of FeMo-cofactor is important for the process of substrate hydrogenation. Its structure has been clarified as Δ-Mo*Fe<sub>7</sub>S<sub>9</sub>C(<i>R</i>-homocit*)(cys)(Hhis) for the efforts of nearly 30 years, while it remains controversial whether FeMo-cofactor is protonated or deprotonated with chelated ≡C-O(H) homocitrate. We have used protonated molybdenum(V) lactates <b>1</b> and its enantiomer as model compounds for <i>R</i>-homocitrate in FeMo-cofactor of nitrogenase. Vibratio  ...[more]

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