Evolution of photosynthesis and aerobic respiration in Cyanobacteria

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Fig. 1 Evolution of photosynthesis and aerobic respiration in Cyanobacteria. Evolution of photosynthesis and aerobic respiration in Cyanobacteria. A cladogram based on the branching order of the concatenated gene tree (120 phylogenetically conserved proteins, table S2) shown in fig. S1. The Cyanobacteria are inferred to be ancestrally nonphototrophic and acquired the ability for photosynthesis (PSI and PSII) after the divergence of the Oxyphotobacteria from the Melainabacteria. The three Cyanobacteria classes likely acquired aerobic respiration independently after the rise of oxygen (atmospheric oxygen is represented by the red shading). Squares and triangles indicate acquisitions of complex III, whereas circles and diamonds indicate acquisitions of complex IV. Oxyphotobacteria acquisitions are shown in green (top), Melainabacteria acquisitions in blue and purple (middle), and Sericytochromatia acquisitions in red and pink (bottom). The different shades indicate phylogenetically distinct versions of a given complex. Square brackets denote operon fusions, and a red “X” indicates putative loss of ETCs. Orders with more than one representative have been collapsed (see table S1 for more detail) with the exception of S15B-MN24. Ga, billion years ago; PRK, phosphoribulokinase. Rochelle M. Soo et al. Science 2017;355:1436-1440 Copyright © 2017, American Association for the Advancement of Science