Salmonella bongori Provides Insights into the Evolution of the Salmonellae
Figure 2
Events in the evolutionary history of Salmonella bongori and S. Typhi, a phenotypically and evolutionarily distant member of S. enterica.
Traits shared by the common ancestor are depicted in blue; those unique to S. bongori are shown in red and those unique to S. Typhi in green. Arrows, Salmonella Pathogenicity Islands (SPIs); extended ovals, fimbriae; circles, effectors; small ovals and needle complexes, secretion systems. Metabolic pathways: lines, enzymatic reactions; open squares, carbohydrates; ovals, pyrimidines; open circles, other substrates; filled shapes, phosphorylated. Novel effectors acquired by S. bongori are secreted by the type III secretion system encoded on SPI-1. SPI-3a and 3b carry the same genes in both organisms but are fused into one island in S. Typhi. SPI-5a also carries the same genes in both organisms, but a further 3 kb (termed SPI-5b) has fused to SPI-5a in S. Typhi. *indicates a pseudogene.