TABLE 2.
Overview of localization, relative G+C contents, and lengths of pathogenicity islands which encode type III secretion system gene clusters
| Organism | Location | Relative G+C content of type III gene cluster (%) (reference) | Medium relative G+C content of rest of genome (%) (reference) | Length (kb) (reference) |
|---|---|---|---|---|
| Yersinia spp. | 70-kb plasmid | 44 | 46–50 | ca. 20 |
| P. aeruginosa | Chromosomal, 55 min (493) | 67.5 (491) | 69 (491) | ? |
| S. typhimurium SPI-1 | Chromosomal centisome 63 | 42–47 (63) | 52 (332) | ca. 40 (312) |
| S. typhimurium SPI-2 | Chromosomal centisome 30.7 | 42–45 (194, 332) | 52 (332) | ? |
| S. flexneri | 220-kb plasmid | 34 (332) | 51 (332) | ca. 31 |
| EPEC | Chromosomal, centisome 82 | 38.4 (102) | 51 (332) | 35.5 |
| Chlamydia spp. | ? | 40 (211) | 41–44% (211) | ? |
| P. syringae | Chromosomal (365) | ca. 61a | ? | 22 (365) |
| E. amylovora | Chromosomal | ca. 58a | ? | ca. 25 (470) |
| R. solanacearum | Megaplasmid | 69.1a | ? | ca. 27 (448) |
| X. campestris | Chromosomal | 64.6a | ? | ca. 25 (61) |
| Rhizobium spp. | sym plasmid (139) | 56 (139) | 58.5% for the sym plasmid (139) | 17.7 (139) |
a
Determined from published sequences.