Ferric iron (Fe3+)

Ferric iron (Fe3+) is a vital transition metal ion that serves as an essential cofactor for numerous biological processes, including DNA synthesis, cellular respiration, and oxygen transport via heme-containing proteins (PubChem CID 23925). In the human host, iron availability is strictly controlled through sequestration by proteins such as transferrin and ferritin, a defense mechanism termed nutritional immunity designed to starve invading pathogens (Nature Reviews Microbiology, 2012, 10(8):525-37). Microorganisms, in turn, have developed high-affinity iron-acquisition systems, such as the secretion of siderophores, to scavenge ferric iron from the host environment to support their growth and virulence (Scientific Reports, 2020, 10:12032). Therapeutically, ferric iron is targeted by chelating agents like deferoxamine and deferasirox to manage systemic iron overload in conditions like thalassemia and hemochromatosis (StatPearls, "Iron Chelators", 2023). Furthermore, novel antimicrobial strategies exploit the microbial need for ferric iron, using siderophore-drug conjugates like cefiderocol to bypass bacterial resistance mechanisms or iron mimetics like gallium to disrupt essential metabolic pathways (FDA, "Fetroja Prescribing Information"; Journal of Clinical Investigation, 2007, 117(4):877-888). The balance of ferric iron is critical, as both deficiency and excess contribute to significant pathology, ranging from anemia to organ damage and increased susceptibility to infection.

Other names

Iron(III)Fe(III)Ferric ionTrivalent iron

Iron chelators bind to ferric iron with high affinity, forming stable complexes that prevent the iron from participating in redox reactions and facilitate its excretion (StatPearls). In antimicrobial therapy, siderophore-drug conjugates like cefiderocol utilize bacterial ferric iron transport systems to cross the outer membrane of Gram-negative bacteria (FDA). Additionally, gallium acts as a ferric iron mimetic, being taken up by cells but failing to function in redox-active enzymes, thereby inhibiting microbial growth (Journal of Clinical Investigation, 2007, 117(4):877-888).