Spectral and Redox Properties of a Recombinant Mouse Cytochrome 561 Protein Suggest Transmembrane Electron Transfer Function.

Cytochrome 561 proteins (CYB561s) are integral membrane proteins with six trans-membrane domains, two heme- redox centers, one on each side of the host membrane. The major characteristics of these proteins are their ascorbate reducibility and trans-membrane electron transferring capability. More than one CYB561 can be found in a wide range of animal and plant phyla and they are localized in membranes different from the membranes participating in bioenergization.