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:
* transport
** hemoglobin
** myoglobin
** neuroglobin
** cytoglobin
** leghemoglobin
* catalysis
** peroxidases
** cytochrome c oxidase
** ligninases
* active membrane transport
** cytochromes
* electron transfer
** cytochrome c