Crossref journal-article
Oxford University Press (OUP)
Genetics (286)
Abstract

Abstract Oxa1p is a mitochondrial inner membrane protein that is mainly required for the insertion/assembly of complex IV and ATP synthase and is functionally conserved in yeasts, humans, and plants. We have isolated several independent suppressors that compensate for the absence of Oxa1p. Molecular cloning and sequencing reveal that the suppressor mutations (CYT1-1 to -6) correspond to amino acid substitutions that are all located in the membrane anchor of cytochrome c1 and decrease the hydrophobicity of this anchor. Cytochrome c1 is a catalytic subunit of complex III, but the CYT1-1 mutation does not seem to affect the electron transfer activity. The double-mutant cyt1-1,164, which has a drastically reduced electron transfer activity, still retains the suppressor activity. Altogether, these results suggest that the suppressor function of cytochrome c1 is independent of its electron transfer activity. In addition to the membranebound cytochrome c1, carbonate-extractable forms accumulate in all the suppressor strains. We propose that these carbonate-extractable forms of cytochrome c1 are responsible for the suppressor function by preventing the degradation of the respiratory complex subunits that occur in the absence of Oxa1p.

Bibliography

Hamel, P., Lemaire, C., Bonnefoy, N., Brivet-Chevillotte, P., & Dujardin, G. (1998). Mutations in the Membrane Anchor of Yeast Cytochrome c1 Compensate for the Absence of Oxa1p and Generate Carbonate-Extractable Forms of Cytochrome c1. Genetics, 150(2), 601–611.

Authors 5
  1. Patrice Hamel (first)
  2. Claire Lemaire (additional)
  3. Nathalie Bonnefoy (additional)
  4. Paule Brivet-Chevillotte (additional)
  5. Geneviève Dujardin (additional)
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Dates
Type When
Created 4 years, 4 months ago (April 27, 2021, 10:34 p.m.)
Deposited 3 years, 7 months ago (Jan. 3, 2022, 6:36 a.m.)
Indexed 1 year, 10 months ago (Oct. 29, 2023, 12:20 p.m.)
Issued 26 years, 10 months ago (Oct. 1, 1998)
Published 26 years, 10 months ago (Oct. 1, 1998)
Published Online 26 years, 10 months ago (Oct. 1, 1998)
Published Print 26 years, 10 months ago (Oct. 1, 1998)
Funders 0

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@article{Hamel_1998, title={Mutations in the Membrane Anchor of Yeast Cytochrome c1 Compensate for the Absence of Oxa1p and Generate Carbonate-Extractable Forms of Cytochrome c1}, volume={150}, ISSN={1943-2631}, url={http://dx.doi.org/10.1093/genetics/150.2.601}, DOI={10.1093/genetics/150.2.601}, number={2}, journal={Genetics}, publisher={Oxford University Press (OUP)}, author={Hamel, Patrice and Lemaire, Claire and Bonnefoy, Nathalie and Brivet-Chevillotte, Paule and Dujardin, Geneviève}, year={1998}, month=oct, pages={601–611} }