Heme proteins, Iron-sulfur proteins, and other metalloenzymes

Metalloenzymes are a broad class of proteins that require metal ions for their structural integrity or catalytic activity[2][6][8]. Key subclasses include heme proteins (which contain heme, an iron–porphyrin complex, such as cytochromes, hemoglobin, myoglobin), and iron–sulfur proteins (which contain iron–sulfur clusters, such as the ferredoxins and components of the mitochondrial electron transport chain)[3][5]. These proteins are fundamental to processes such as cellular respiration, photosynthesis, electron transport, metabolism, signal transduction, antioxidant defense, and DNA repair[2][3][4][6]. While individual members of these families (such as cytochrome P450, superoxide dismutase, and nitric oxide synthase) are established therapeutic targets, the phrase as written refers to a diverse superfamily rather than a single molecular entity[8]. **This entry is not a specific canonical molecular target but a catch-all grouping of biologically important metalloproteins and should be replaced with specific molecules (e.g., "Cytochrome c oxidase," "Ferredoxin," "Superoxide dismutase") for use in structured databases or therapeutic targeting.**

Other names

MetalloproteinsMetalloenzymesHeme protein familyIron–sulfur protein family

Inhibition or modulation of catalytic activity; Coordination to metal centers to block substrate binding; Chelation of metal ion to disrupt enzyme function