Figure 5

Phylogeny of homologs of cation-transporting ATPases. Members of the QuartOP are highlighted in red. The three support values indicated on a branch are bootstrap support values from Neighbor-Joining trees based on TREE-PUZZLE distances, bootstrap support values from parsimony analyses and posterior probabilities from Bayesian analyses respectively. See Materials and Methods for details on phylogenetic reconstruction. The finding of other homologs from alpha proteobacteria grouping with the Rhodopseudomonas and Rhodobacter sequences, and the finding of both homologs coexisting in the same genome (Sinorhizobium) suggests that this QuartOP represents a case of unrecognized paralogy with differential gene loss.