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. 2011 Jan 10;16(1):442–465. doi: 10.3390/molecules16010442

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© 2011 by the authors;

licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

PMC Copyright notice

(a) Mo containing nitrogenase enzyme (PDB code: 1N2C), only half of the protein is shown for clarity. In the upper part the two chains of the Fe protein are shown in which the adenosine diphosphate (ADP) units and the Fe₄S₄ cluster are represented in van der Waals spheres. These are involved in the electron transfer to the catalytic unit. In the lower part of the picture is represented the MoFe protein where are placed the P-cluster and the FeMo-co, which mediates electron transfer and which performs N₂ fixation, respectively. In (b) FeMo-co of the nitrogenase is shown; In (c) a ball and stick representation of the Schrock’s Mo catalyst is provided. Hydrogens are omitted for clarity.