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- W2014879101 abstract "The 14-kDa Qcr7 protein represents one of the 10 subunits that are components of a functional cytochrome bc(1) complex in Sacharomyces cerevisiae. Previous studies have shown that the N-terminus of the Qcr7 protein may be involved in the assembly of the cytochrome bc(1) complex and its C-terminus by interacting with cytochrome b and QCR8 proteins. It has also been suggested that Qcr7 protein may be involved in proton pumping. The coding sequence for two highly conserved aspartate residues, D46 and D47, in the QCR7 gene was altered by site-directed mutagenesis and the mutated genes expressed in cells lacking a functional QCR7 gene. Mutants D46E, D46G, D46N, and D47E were comparable to wild type in growth phenotype on nonfermentable carbon sources. Mutants D47G and D47N were respiratory deficient and analysis of complex components by immunoblotting and spectral analysis of cytochrome b suggests defective assembly. Despite being respiratory competent and having normal electron transport rates in broken mitochondria, the mutant D46G had markedly reduced ATP synthesis from electron transport reactions catalyzed by complexes II plus III of the respiratory chain. This suggests that the geometry of proton uptake by the bc(1) complex is disturbed by the mutation in D46." @default.
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- W2014879101 date "2001-09-01" @default.
- W2014879101 modified "2023-10-14" @default.
- W2014879101 title "The Functional Role of Conserved Acidic Residues of the Qcr7 Protein of the Cytochrome bc1 Complex in Saccharomyces cerevisiae" @default.
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- W2014879101 doi "https://doi.org/10.1006/abbi.2001.2497" @default.
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