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Cited by 169

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Diphosphatidylglycerol is required for optimal activity of beef heart cytochrome c oxidase.

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Vik, S B, Georgevich, G, Capaldi, R A·1981·Proceedings of the National Academy of Sciences

Abstract

Isolated beef heart cytochrome c oxidase (ferrocytochrome c:oxygen oxidoreductase, EC 1.9.3.1) contains four or five molecules of tightly bound diphosphatidylglycerol per monomer (2-heme complex). This lipid could be removed in part, or wholly, by mixing the enzyme with high concentrations of Triton X-100 and then centrifuging the mixture through a glycerol gradient equilibrated in the same detergent. Cytochrome c oxidase retaining three or more diphosphatidylglycerol molecules per monomer was fully active when assayed in 1-oleoyl lysophosphatidylcholine. Upon removal of one or more of these diphosphatidylglycerols, enzymic activity was lost. Full activation could be obtained by adding diphosphatidylglycerol to the assay mixture along with lysophosphatidylcholine but not by adding phosphatidylcholine or phosphatidylethanolamine. Direct binding experiments, kinetic studies, and previous work using arylazidocytochrome c derivatives [Bisson, R., Jacobs, B. & Capaldi, R. A. (1980) Biochemistry 10, 4173-4178], indicate that diphosphatidylglycerol is involved in binding of substrate cytochrome c to cytochrome c oxidase.

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Metadata

Authors
Vik, S. B., Georgevich, G., & Capaldi, R. A.
Venue
Proceedings of the National Academy of Sciences
Published
1981-03
Volume
78
Issue
3
Pages
1456-1460
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W1992973572
Cited by
169
References
1
FWCI
5.42
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Diphosphatidylglycerol is required for optimal activity of beef heart cytochrome c oxidase. https://app.cochat.ai/papers/10.1073/pnas.78.3.1456
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Vik, S. B., Georgevich, G., & Capaldi, R. A. (1981). Diphosphatidylglycerol is required for optimal activity of beef heart cytochrome c oxidase. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.78.3.1456

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