Intracellular protein with metal-chelating site

Intracellular proteins with metal-chelating sites comprise a heterogeneous group of proteins that possess amino acid residues (e.g., cysteine, histidine, glutamate, aspartate) forming binding pockets or sites able to tightly coordinate metal ions such as iron, copper, zinc, and manganese. This capability underlies crucial physiological roles in metal transport, storage, detoxification, and enzymatic reactions. Representative examples include metallothioneins (primarily metal storage and detoxification), enzymes such as monoamine oxidase and superoxide dismutase, and transporters like cation diffusion facilitators. Dysregulation of these proteins or their metal-binding properties contributes to the pathogenesis of diverse diseases, including neurodegenerative disorders, cancer, and systemic metal overload. While these proteins are not typically drug targets themselves, their metal-binding properties are exploited therapeutically by chelating agents designed to modulate metal ion bioavailability and mitigate metal-induced cellular toxicity.

Other names

Metal-binding intracellular proteinsIntracellular metal-chelating proteinsCellular metalloproteins

Chelation of metal ions, preventing excess accumulation and toxicity Enzyme inhibition (e.g., inhibiting MAO by chelating iron) Regulating oxidative stress via metal binding Modulation of cell signaling pathways involving metal ions