Figure 6

Phylogenetic and cluster structure analysis. Left. Phylogenetic tree inferred for UreC proteins. The tree topology and branch lengths were obtained with Maximum Likelihood method (as implemented in PhyML) with the JTT matrix. 100 bootstrap replicates were performed and the values, other than 100, are shown. S. coelicolor (SCO1234) was taken as outgroup. Right. Genetic structure of the clusters in each of the versions and species analyzed in the phylogenetic tree. Structures were obtained mainly from the MBGD database (see Methods). Boxes with arrows represent genes with relative direction of transcription. Fill-in code: dotted, ureA; dark gray, ureB; horizontal stripped, fusion of ureA and ureB genes; black, ureC; diagonal stripped, ureD; light gray, accessory genes ureE, ureF and ureG. When only two appear, lacking one is ureE. In Bradyrhizobium BTAi1, in the cluster of gene 1962, ureH appears instead of ureD. A fourth accessory gene, an urea transporter, appears in B. suis cluster 2 and Y. pseudotuberculosis near to ureD. White; hypothetical or unrelated genes. Slashes for P. syringae tomato denote that these genes are not contiguous.