Molecular Mechanism for Nitrogen fixation: first steps

Physics – Biological Physics

Scientific paper

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5 pages 2 Figures

Scientific paper

N2 association to the FeMo-cofactor of nitrogenase, including the recently identified central N ligand, has been investigated using first-principles electronic structure calculations. The oxidation state of the resting state of the cofactor and its electronic structure has been identified. A single proton is added to the sulfur bridges following each electron transfer to the cofactor. During N2 association, the cofactor undergoes large rearrangements resulting in opening the central Fe-cage of the cofactor. N2 binds axially while the bond of the bridging SH group breaks. It is then able to insert between the two Fe sites in a bridged configuration.

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