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• W2080886664 abstract "Resolution of the crystal structure of the mitochondrial cytochrome bc(1) complex has indicated that the extra-membranous extrinsic domain of the iron-sulfur protein containing the 2Fe2S cluster is connected by a tether to the transmembrane helix that anchors the iron-sulfur protein to the complex. To investigate the role of this tether in the cytochrome bc(1) complex, we have mutated the conserved amino acid residues Ala-86, Ala-90, Ala-92, Lys-93 and Glu-95 and constructed deletion mutants DeltaVLA(88-90) and DeltaAMA(90-92) and an insertion mutant I87AAA88 in the iron-sulfur protein of the yeast, Saccharomyces cerevisiae. In cells grown at 30 degrees C, enzymatic activities of the bc(1) complex were reduced 22-56% in mutants A86L, A90I, A92C, A92R and E95R, and the deletion mutants, DeltaVLA(88-90) and DeltaAMA(90-92), while activity of the insertion mutant was reduced 90%. No loss of cytochromes b or c-c(1), detected spectrally, or the iron-sulfur protein, determined by quantitative immunoblotting, was observed in these mutants with the exception of the mutants of Ala-92 in which the loss of activity paralleled a loss in the amount of the iron-sulfur protein. EPR spectroscopy revealed no changes in the iron-sulfur cluster of mutants A86L, A90I, A92R or the deletion mutant DeltaVLA(88-90). Greater losses of both protein and activity were observed in all of the mutants of Ala-92 as well as in A90F grown at 37 degrees C. suggesting that these conserved alanine residues may be involved in maintaining the stability of the iron-sulfur protein and its assembly into the bc(1) complex. By contrast, no significant loss of iron-sulfur protein was observed in the mutants of Ala-86 in cells grown at either 30 degrees C or 37 degrees C despite the 50-70% loss of enzymatic activity suggesting that Ala-86 may play a critical role in catalysis in the bc(1) complex." @default.
• W2080886664 created "2016-06-24" @default.
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• W2080886664 date "2000-02-01" @default.
• W2080886664 modified "2023-10-03" @default.
• W2080886664 title "Mutations in the tether region of the iron–sulfur protein affect the activity and assembly of the cytochrome bc1 complex of yeast mitochondria" @default.
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• W2080886664 doi "https://doi.org/10.1016/s0005-2728(99)00116-4" @default.
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