Gallium(III) ion (Ga3+)

Gallium(III) ion is a trivalent metal cation that functions as a structural and chemical mimetic of ferric iron (Fe3+) (Chitambar, 2010; PubChem CID 24266). Due to its similar ionic radius, it can compete with iron for binding sites on transport proteins like transferrin and uptake into cells via transferrin receptors (StatPearls, 2023). However, unlike iron, gallium cannot be reduced to a divalent state under physiological conditions, which prevents it from participating in redox-dependent enzymatic reactions (Chitambar, 2010). This metabolic interference leads to the inhibition of critical iron-dependent enzymes, most notably ribonucleotide reductase, which is essential for DNA synthesis and cell proliferation (Bernstein, 1998). In clinical practice, gallium is used to treat hypercalcemia of malignancy by inhibiting osteoclast-mediated bone resorption and increasing bone mineral content (StatPearls, 2023). It also shows promise as an antimicrobial agent against pathogens like Pseudomonas aeruginosa by disrupting bacterial iron acquisition (Bonchi et al., 2014). Additionally, radioactive isotopes of gallium are indispensable in diagnostic imaging for identifying sites of infection, inflammation, and malignancy (Wikipedia, 2024).

Other names

Gallium(3+)Gallium cationGa(III)Gallium ion

Gallium(III) acts as a metabolic mimic of ferric iron (Fe3+). It binds to transferrin and enters cells via transferrin receptor-mediated endocytosis. Because gallium cannot be reduced to a divalent state like iron, it competitively inhibits iron-dependent enzymes such as ribonucleotide reductase, thereby halting DNA synthesis and inducing apoptosis. In bone tissue, it localizes to areas of high turnover, inhibiting osteoclast activity and reducing the solubility of hydroxyapatite crystals to prevent bone resorption (Chitambar, 2010; StatPearls, 2023).