TABLE 1.
Iron sources and relevant uptake systems in E. coli, C. jejuni, and H. pylori
| Organism and iron source | Uptake system | Reference(s) |
|---|---|---|
| E. coli | ||
| Ferri-enterochelin | Fep, Cir, Fiu | 386, 449 |
| Ferri-hydroxamatesa | FhuA | 172, 303, 343 |
| Rhodotorulic acid | FhuE | 519 |
| Heme/hemoglobin | ChuA, Hbp | 466, 603 |
| Ferrous iron | Feo | 243, 306 |
| Ferric citrate | Fec | 493 |
| C. jejuni | ||
| Ferri-enterochelin | CfrA, CfrB, Ceu | 37, 233, 467, 502, 655 |
| Ferrichrome | CfuA | 195 |
| Rhodotorulic acid | P19, Cj1588-Cj1663 | 283, 574 |
| Heme | Chu | 503 |
| Transferrin | Cj0173c-Cj0178 (Cfbp/Ctu) | 419, 611 |
| Lactoferrin | Cj0173c-Cj0178 (Cfbp/Ctu) | 419, 611 |
| Ovotransferrin | Cj0173c-Cj0178 (Cfbp/Ctu) | 419, 611 |
| Ferrous iron | Feo | 439 |
| H. pylori | ||
| Ferrous iron | Feo | 599, 614 |
| Hemoglobin | FrpB2 | 212, 533 |
| Transferrin | Unknown | 533 |
| Lactoferrin | Unknown | 274, 533 |
| Heme | Unknown | 134, 649 |
| Ferric citrate | Fecb | 117, 599, 614 |
a
Hydroxamates include both aerobactin and ferrichrome.
b
The function of the Fec system in H. pylori has not been fully verified.