Demonstration of two isoforms of subunit VIIa of cytochrome c oxidase from human skeletal muscle : Implications for mitochondrial myopathies

Two different isoforms of subunit VIIa have been found in cytochrome c oxidase isolated from human skeletal muscle. The first 22 residues of the N-terminal amino acid sequences showed 5 differences. Our results provide the first conclusive evidence for the existence of cytochrome c oxida isoenzymes...

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Veröffentlicht in:FEBS letters 1990-04, Vol.263 (2), p.213-216
Hauptverfasser: Van Beeumen, Jozef J., Van Kuilenburg, André B.P., Van Bun, Stefaan, Van den Bogert, Coby, Tager, Joseph M., Muijsers, Anton O.
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Sprache:eng
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Zusammenfassung:Two different isoforms of subunit VIIa have been found in cytochrome c oxidase isolated from human skeletal muscle. The first 22 residues of the N-terminal amino acid sequences showed 5 differences. Our results provide the first conclusive evidence for the existence of cytochrome c oxida isoenzymes in man. Since the two cytochrome c oxidase isoforms were both present in skeletal muscle tissue, though not necessarily in the same cell type, this suggests that human cytochrome c oxidase isoforms are not strictly tissue-specific. These findings may have important implications for the elucidation of genetic diseases in man in which a deficiency of cytochrome c oxidase is restricted to certain tissues.
ISSN:0014-5793
1873-3468
DOI:10.1016/0014-5793(90)81376-Y