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. Author manuscript; available in PMC: 2021 Jun 24.
Published in final edited form as: Chem Rev. 2020 Mar 4;120(12):5107–5157. doi: 10.1021/acs.chemrev.9b00704

Figure 3.

Figure 3.

Proposed pathways for M-, V- and Fe-cluster biosynthesis. Area shaded in gray represents the common portion of the pathway, including the proteins NifU, NifS, NifV and NifB. Area shaded in blue represents the M-cluster specific maturation pathway, and the red shaded area depicts the V- and Fe-cluster specific maturation pathways. Experimentally verified steps are indicated by solid arrows whereas putative assignments are indicated by dotted arrows. See the main text for detailed descriptions.