Canadian Medical Guide > Chemicals and Drugs > Enzymes and Coenzymes > Cytochromes > Cytochrome a Group Terms and Definitions




Cytochrome a Group

Medical Definition: Cytochromes (electron-transporting proteins) in which the heme prosthetic group is heme a, i.e., the iron chelate of cytoporphyrin IX. (From Enzyme Nomenclature, 1992, p539)
Guide Notes: spell in titles & translations with lowercase a: cytochrome a; do not confuse with CYTOCHROMES A
Previously Indexed: Cytochromes (1979-1993)
Cytochrome a Group Categories.
Canadian Medical Guide Definition Cytochromes a - A subclass of heme a containing cytochromes that have two imidazole nitrogens as axial ligands and an alpha-band absorption of 605 nm. They are found in a variety of microorganisms and in eucaryotes as a low-spin cytochrome component of MITOCHONDRIAL ELECTRON TRANSPORT COMPLEX IV.
Canadian Medical Guide Definition Cytochromes a1 - A subclass of heme a containing cytochromes have a reduced alpha-band absorption of 587-592 nm. They are primarily found in microorganisms.
Canadian Medical Guide Definition Cytochromes a3 - A subclass of heme a containing cytochromes with an alpha-band absorption of 605 nm. They are found in a variety of microorganisms and in eukaryotes as a high-spin cytochrome component of MITOCHONDRIAL ELECTRON TRANSPORT COMPLEX IV.

Cytochrome a Group Medical Definitions and Terms

CANADIAN MEDICAL GUIDE

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