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. 2020 Feb 17;18(3):394–411. doi: 10.1111/gbi.12381

Figure 3.

Figure 3

Active‐site protein environment of representative ancestral and extant nitrogenases. All residues located within 5 Å of any atom in either the FeMo‐cofactor of the A. vinelandii NifD protein (PDB http://www.rcsb.org/pdb/search/structidSearch.do?structureId=3U7Q; Spatzal et al., 2011) or the FeV‐cofactor of the A. vinelandii VnfD protein (5N6Y; Sippel & Einsle, 2017). Residue numbering from aligned A. vinelandii NifD. Cys‐275 and His‐442 residues that coordinate the cofactor are indicated by red arrows. Phylogeny coloring is as follows: Clfx, yellow; F‐Mc, green; Mb‐Mc, purple; Anf/Vnf, red; Nif‐I/‐II, blue [Colour figure can be viewed at http://wileyonlinelibrary.com]