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. Author manuscript; available in PMC: 2010 Jun 15.
Published in final edited form as: Inorg Chem. 2009 Jun 15;48(12):5106–5116. doi: 10.1021/ic802440h

Figure 1.

Figure 1

The FeMoco of iron-molybdenum nitrogenase in the resting state.4 X is a light atom (C, N, or O) that lies 2.0 Å from the six “belt” iron atoms. The iron atoms along the “belt” are coordinated to three bridging sulfides. We hypothesize that reduction of the cofactor transiently gives a three-coordinate iron site that can bind substrate. 6