Properties of the Dicyclohexylcarbodiimide-Binding Subunit of Cytochrome <italic>c</italic> Oxidase from Sweet Potato

Subunit IV of cytochrome c oxidase from sweet potato was bound with dicyclohexylcarbodiimide and synthesized in isolated mitochondria. Thus, this subunit corresponds to subunit HI of the analogous mammalian and fungal enzymes. Subunit IV was a mixture of two polypeptides (subunits IVa and IVb) which differed slightly in structure.