Figure 3
From: Distribution of nitrogen fixation and nitrogenase-like sequences amongst microbial genomes
Alignment of residues flanking conserved FeMoco ligands in NifD/VnfD/AnfD proteins. Alignment of residues flanking the conserved co-factor ligands, Cys275 and His442, in the alpha subunit of Mo-dependent and alternative nitrogenases. (The sequence numbering refers to A. vinelandii NifD, Avin_01390.) Protein groups labeled A and B correspond to subfamilies 2 and 1 respectively, previously identified by Kechris et al. [23]. Group C represent the additional sub family described in the text. Group V corresponds to AnfD and VnfD sequences.