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Components of the mitochondrial inner membrane. 3. Characterization of a seventh different subunit of beef heart cytochrome c oxidase. Similarities between the beef heart enzyme and that from other species
Abstract
Beef heart cytochrome c oxidase has been resolved into seven subunits by electrophoresis in highly cross-linked gels containing urea and sodium dodecyl sulfate. The molecular weights of the polypeptides are estimated to be I, 35 400; II, 24 100; III, 21 000; IV, 16 800; V, 12 400; VI, 8200; and VII, 4400. It has been shown that subunits II and III can coelectrophorese on standard sodium dodecyl sulfate-polyacrylamide gels and appear as a single component with an apparent molecular weight of 22 500. This accounts for previous reports that the beef heart enzyme contains only six subunits. Amino acid analysis of the isolated subunits I, II, and III revealed that they have polarities of 35.5, 44.7, and 39.9%, respectively. All three subunits have an extremely high leucine content and a low percentage of basic amino acids relative to subunits IV-VII. The size, number, and properties of subunits in the beef heart cytochrome c oxidase complex suggest that it has essentially the same subunit structure as the complexes isolated from Saccharomyces cerevisiae and Neurospora crassa.
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Citations
Cited by
A two-subunit cytochrome c oxidase (cytochrome aa3) from Paracoccus dentrificans.
Ludwig, B., & Schatz, G. (1980) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.77.1.196 · Cited by 256
Nucleotide sequence preservation of human mitochondrial DNA.
Monnat, R. J., & Loeb, L. A. (1985) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.82.9.2895 · Cited by 105
Metadata
- Authors
- Downer, N. W., Robinson, N. C., & Capaldi, R. A.
- Venue
- Biochemistry
- Publisher
- American Chemical Society (ACS)
- Published
- 1976-06-29
- Volume
- 15
- Issue
- 13
- Pages
- 2930-2936
- ISSN
- 0006-2960 (ISSN-L)
- 1520-4995
- OpenAlex
- W2063458954
- Cited by
- 250
- References
- 0
- FWCI
- 10.60
- Type
- journal article
- Language
- en
- Open access
- closed
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- CoChat. (2026). Citation check: Components of the mitochondrial inner membrane. 3. Characterization of a seventh different subunit of beef heart cytochrome c oxidase. Similarities between the beef heart enzyme and that from other species. https://app.cochat.ai/papers/10.1021/bi00658a036
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- Downer, N. W., Robinson, N. C., & Capaldi, R. A. (1976). Components of the mitochondrial inner membrane. 3. Characterization of a seventh different subunit of beef heart cytochrome c oxidase. Similarities between the beef heart enzyme and that from other species. Biochemistry. https://doi.org/10.1021/bi00658a036
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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