Bacterial iron-binding protein

Bacterial iron-binding protein refers to a diverse group of proteins essential for the survival and virulence of pathogenic bacteria by facilitating the acquisition of iron from the host environment (Source: UniProt). Because free iron is extremely scarce in human tissues, bacteria utilize these proteins, including TonB-dependent receptors and periplasmic binding proteins, to scavenge iron from host sources like transferrin and lactoferrin (Source: PubMed: 30254244). These proteins are critical therapeutic targets, particularly for the Trojan horse strategy where antibiotics are conjugated to siderophore-like molecules to be actively transported into the bacterial cell (Source: PubMed: 31533903). Cefiderocol is a clinically approved siderophore cephalosporin that exploits these iron-binding systems to overcome resistance in Gram-negative bacteria (Source: FDA). Beyond transport, these proteins are involved in maintaining iron homeostasis and supporting essential metabolic functions like DNA synthesis and respiration. Targeting these systems provides a pathway to treat multi-drug resistant infections by bypassing traditional cell wall permeability barriers. Furthermore, experimental therapies using iron mimics like gallium aim to disrupt bacterial metabolism by competing for these binding sites (Source: PubMed: 23535945). The high specificity of these bacterial systems compared to human iron-handling proteins makes them attractive candidates for narrow-spectrum antimicrobial development.

Other names

Bacterial iron-binding proteinsBacterial iron-acquisition proteinsFerric-binding proteinsSiderophore-binding proteinsPeriplasmic iron-binding proteinsTonB-dependent receptors

Siderophore-mediated active transport (Trojan horse strategy), competitive inhibition of iron uptake, and metabolic disruption via iron-mimicry.