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. 2017 Nov 14;8:1947. doi: 10.3389/fpls.2017.01947

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Copyright © 2017 Arragain, Jiménez-Vicente, Scandurra, Burén, Rubio and Echavarri-Erasun.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Occurrence NifB architectures in diazotrophs. (A) Scheme of the three different NifB architectures and representative species known to possess them. The SAM-radical is shown in green, the NifX-like domain in red, and the NifN-like domain in blue. Color dots represent motifs strictly conserved in the SAM-radical domain. The scale bar represents 100 amino acids. (B) Overall distribution and relative frequency of NifB architectures in putative diazotrophs. Green dot represents the SAM-radical domain; red dot represents the NifX-like domain; blue dot represents the NifN-like domain. This panel was generated by overlapping data from Supplementary Table 1 with a 3-domain taxonomic tree of life modified from Boyd and Peters (2013)..