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. 1970 Dec;120(3):467–478. doi: 10.1042/bj1200467

Specificity and locale of the l-3-glycerophosphate–flavoprotein oxidoreductase of mitochondria isolated from the flight muscle of Sarcophaga barbata Thoms

J F Donnellan 1, M D Barker 1, J Wood 1, R B Beechey 1
PMCID: PMC1179626  PMID: 5499959

Abstract

1. The oxidation of l-3-glycerophosphate by flight-muscle mitochondria isolated from the flesh fly Sarcophaga barbata has been studied. Use of substrate analogues indicates that the catalytic and effector l-3-glycerophosphate binding sites on the allosteric l-3-glycerophosphate–flavoprotein oxidoreductase differ markedly in specificity. 2. The l-3-glycerophosphate–cyanoferrate oxidoreductase system in these mitochondria is antimycin-insensitive whereas the corresponding NADH–cyanoferrate oxidoreductase is extremely sensitive to this respiratory-chain inhibitor. Also no swelling is observed when these mitochondria are suspended in iso-osmotic solutions of ammonium glycerophosphate in contrast with the extensive swelling seen in similar solutions of ammonium pyruvate. These observations indicate that l-3-glycerophosphate does not penetrate the mitochondrial matrix whereas pyruvate does. 3. Submitochondrial particles catalyse the ATP-driven reduction of NAD+ by l-3-glycerophosphate but at a far lower rate than that seen when succinate is the electron donor. These particles do not have an energy-linked pyridine nucleotide transhydrogenase activity. 4. We conclude that the l-3-glycerophosphate–flavoprotein oxidoreductase is located on the outer surface of the inner membrane of the flight-muscle mitochondria.

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Selected References

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