Hemoprotein

A hemoprotein (also haemoprotein), or heme protein, is a metalloprotein containing a heme prosthetic group, either covalently or noncovalently bound to the protein itself. The iron in the heme is capable of undergoing oxidation and reduction (usually to +2 and +3, though stabilized ferryl [Fe+4] compounds are well known in the peroxidases).

Roles
Hemoproteins have diverse biological functions including:


 * oxygen transport
 * hemoglobin
 * myoglobin
 * neuroglobin
 * cytoglobin
 * leghemoglobin
 * catalysis
 * peroxidases
 * cytochrome c oxidase
 * ligninases
 * active membrane transport
 * cytochromes
 * electron transfer
 * cytochrome c
 * catalase
 * Sensory
 * FixL (Oxygen sensor)
 * sGC (Nitric Oxide sensor)
 * CooA (CO sensor)