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. 1985 Jul;82(13):4517–4520. doi: 10.1073/pnas.82.13.4517

Deficiency of electron transfer flavoprotein or electron transfer flavoprotein:ubiquinone oxidoreductase in glutaric acidemia type II fibroblasts.

F E Frerman, S I Goodman
PMCID: PMC391133  PMID: 2989828

Abstract

Glutaric acidemia type II (GA II) is a human genetic disorder. It has been suggested that the primary defect in this disorder is a deficiency of a protein involved in electron transport between the acyl-CoA dehydrogenases and the bc1 complex of the mitochondrial respiratory chain. Antisera were raised to purified porcine electron transfer flavoprotein (ETF) and electron transfer flavoprotein:ubiquinone oxidoreductase (ETF:QO). The antisera were used to detect the two electron transferases in control and GA II fibroblasts by immunoblotting. Fibroblasts from three unrelated GA II patients were deficient in immunologically detectable ETF:QO and extracts from these three fibroblast lines contained no detectable ETF:QO catalytic activity. Fibroblasts from parents of two of these patients had ETF:QO activity intermediate between activities in control fibroblasts and fibroblasts from the patients. These data indicate that the primary defect in these patients is a deficiency of ETF:QO and that the mode of transmission of the gene is autosomal recessive. Fibroblasts from two other patients with severe GA II had normal levels of ETF-QO activity and antigen but were deficient in immunoreactive ETF. These findings show that GA II results from a deficiency of ETF in some patients and ETF:QO in others. In addition, these investigations provide strong evidence for the specificity and physiological function of the iron-sulfur flavoprotein ETF:QO.

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Selected References

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