Cytochrome a Group
| 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) |
| 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.
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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. |
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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. |
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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 Definitions and Terms
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