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- * Cytochrome c oxidase subunit II, copper A binding region signature *
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-
- Cytochrome c oxidase (EC 1.9.3.1) [1] is an oligomeric enzymatic complex which
- is a component of the respiratory chain complex and is involved in the
- transfer of electrons from cytochrome c to oxygen. In eukaryotes this enzyme
- complex is located in the mitochondrial inner membrane; in aerobic prokaryotes
- it is found in the plasma membrane. Electrons originating in cytochrome c are
- transferred via heme a and copper A (Cu(a)) to the binuclear center formed by
- heme a3 copper B (Cu(b)). Subunit II (CO II) of cytochrome c oxidase binds the
- Cu(a), four residues seem [2] to be implicated in the binding of the metal
- ion: two cysteines and two histidines. Three of these copper ligands are
- clustered in a stretch of nine amino acid residues. We use this region as a
- signature pattern for CO II.
-
- -Consensus pattern: C-[SA]-x(2)-C-G-x(2)-H
- [The two C's and the H are copper ligands]
- -Sequences known to belong to this class detected by the pattern: ALL, except
- for Leishmania tarentolae CO II.
- -Other sequence(s) detected in SWISS-PROT: NONE.
- -Last update: April 1990 / Pattern and text revised.
-
- [ 1] Capaldi R.A., Malatesta F., Darley-Usmar V.M.
- Biochim. Biophys. Acta 726:135-148(1983).
- [ 2] Holm L., Saraste M., Wikstrom M.
- EMBO J. 6:2819-2823(1987).
-