Bacterial iron transporter (None standardized; individual systems may use abbreviations (e.g., FeoB, SitABCD, Yfe, Ftr1p, ABC transporters))

Bacterial iron transporters are membrane proteins and complexes responsible for the uptake of iron, an essential nutrient for bacterial metabolism and growth. Since iron is tightly sequestered in hosts, bacteria have evolved multiple specialized transporters to acquire iron from the environment or host during infection. These include ABC transporters, major facilitator superfamily transporters, and a variety of siderophore receptors—proteins that bind iron-chelating agents (siderophores) secreted by bacteria to scavenge iron. Prominent systems include FeoB (ferrous iron transporter), FepA/FhuA (siderophore receptors for ferric iron), and SitABCD and YfeABCD families. Their activity supports bacterial virulence and persistence, thus these transporters are attractive targets for new antimicrobial agents, including drugs that exploit them to enter bacterial cells (“Trojan horse” antibiotics like cefiderocol) or that block iron uptake directly. Redundant and overlapping pathways exist within and between bacterial species, presenting unique challenges for therapeutic targeting[1][2][3][4][5][7].

Other names

Iron transporterFe transporter (e.g., FeoB, FepA, SitABCD, YfeABCD)Siderophore receptor (e.g., FepA, FhuA)Ferrous iron transporter (e.g., FeoB, SitABCD)Ferric iron transporterSiderophore-mediated iron transporters

Inhibition of iron transport: drugs may block the transporter, preventing iron uptake and starving bacteria of a necessary nutrient; Trojan horse strategy: drugs (e.g., antibiotics) linked to siderophores are transported into bacteria via iron transporters, increasing drug uptake and potency