Molybdenum L-Edge XAS Spectra of MoFe Nitrogenase

A molybdenum L‐edge X‐ray absorption spectroscopy (XAS) study is presented for native and oxidized MoFe protein of nitrogenase as well as Mo‐Fe model compounds. Recently collected data on MoFe protein (in oxidized and reduced forms) is compared to previously published Mo XAS data on the isolated FeM...

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Bibliographic Details
Published in:Zeitschrift für anorganische und allgemeine Chemie (1950) 2015-01, Vol.641 (1), p.65-71
Main Authors: Bjornsson, Ragnar, Delgado-Jaime, Mario U., Lima, Frederico A., Sippel, Daniel, Schlesier, Julia, Weyhermüller, Thomas, Einsle, Oliver, Neese, Frank, DeBeer, Serena
Format: Article
Language:English
Subjects:
FeMoco
L-edges
Molybdenum
Nitrogenase
Proteins
Spectrum analysis
X-ray spectroscopy
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Summary:A molybdenum L‐edge X‐ray absorption spectroscopy (XAS) study is presented for native and oxidized MoFe protein of nitrogenase as well as Mo‐Fe model compounds. Recently collected data on MoFe protein (in oxidized and reduced forms) is compared to previously published Mo XAS data on the isolated FeMo cofactor in NMF solution and put in context of the recent Mo K‐edge XAS study, which showed a MoIII assignment for the molybdenum atom in FeMoco. The L3‐edge data are interpreted within a simple ligand‐field model, from which a time‐dependent density functional theory (TDDFT) approach is proposed as a way to provide further insights into the analysis of the molybdenum L3‐edges. The calculated results reproduce well the relative spectral trends that are observed experimentally. Ultimately, these results give further support for the MoIII assignment in protein‐bound FeMoco, as well as isolated FeMoco.
ISSN:0044-2313
1521-3749
DOI:10.1002/zaac.201400446