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. 2016 Aug 26;7:1343. doi: 10.3389/fmicb.2016.01343

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Copyright © 2016 Tsoy, Ravcheev, Čuklina and Gelfand.

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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Major evolutionary events in analyzed Alphaproteobacteria. The species tree was extracted from the MicrobesOnline web-resource (Dehal et al., 2010). The numbers on the branches represent major events: (1) NifA is a regulator of nitrogen fixation, FnrN is a regulator of aerobic respiration; (2) loss of NifA; (3) loss of FnrN, horizontal transfer of the fixLJ-fixK gene cluster from Rhizobiales, and expansion of the FixK regulon by the cyd and cco genes; (4) horizontal transfer of the nitrogen fixation locus from Rhodospirillales; (5) appearance of FixK and FixJ; (6) appearance of FixKf and FxkR.