Cited by 32Mitochondrial Function and PathologyFungal and yeast genetics researchMetalloenzymes and iron-sulfur proteins

Altered sterol metabolism in budding yeast affects mitochondrial iron-sulfur (Fe-S) cluster synthesis

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Ward, Diane M., Chen, Opal S., Li, Liangtao, Kaplan, Jerry, Bhuiyan, Shah Alam, Natarajan, Selvamuthu K., Bard, Martin, Cox, James E.·2018·Journal of Biological Chemistry

Abstract

Ergosterol synthesis is essential for cellular growth and viability of the budding yeast Saccharomyces cerevisiae, and intracellular sterol distribution and homeostasis are therefore highly regulated in this species. Erg25 is an iron-containing C4-methyl sterol oxidase that contributes to the conversion of 4,4-dimethylzymosterol to zymosterol, a precursor of ergosterol. The ERG29 gene encodes an endoplasmic reticulum (ER)-associated protein, and here we identified a role for Erg29 in the methyl sterol oxidase step of ergosterol synthesis. ERG29 deletion resulted in lethality in respiring cells, but respiration-incompetent (Rho− or Rho0) cells survived, suggesting that Erg29 loss leads to accumulation of oxidized sterol metabolites that affect cell viability. Down-regulation of ERG29 expression in Δerg29 cells indeed led to accumulation of methyl sterol metabolites, resulting in increased mitochondrial oxidants and a decreased ability of mitochondria to synthesize iron–sulfur (Fe-S) clusters due to reduced levels of Yfh1, the mammalian frataxin homolog, which is involved in mitochondrial iron metabolism. Using a high-copy genomic library, we identified suppressor genes that permitted growth of Δerg29 cells on respiratory substrates, and these included genes encoding the mitochondrial proteins Yfh1, Mmt1, Mmt2, and Pet20, which reversed all phenotypes associated with loss of ERG29. Of note, loss of Erg25 also resulted in accumulation of methyl sterol metabolites and also increased mitochondrial oxidants and degradation of Yfh1. We propose that accumulation of toxic intermediates of the methyl sterol oxidase reaction increases mitochondrial oxidants, which affect Yfh1 protein stability. These results indicate an interaction between sterols generated by ER proteins and mitochondrial iron metabolism.

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Crossref · 10.1074/jbc.ra118.001781

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  • Erg29 participates in the methyl sterol oxidase step of ergosterol biosynthesis, similarly to Erg25.

    “A recent study has revealed that, similarly to Erg25, Erg29 participates in the methyl sterol oxidase step of ergosterol biosynthesis [13].”

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  1. Ichikawa, Y., Bayeva, M., Ghanefar, M., Potini, V., Sun, L., Mutharasan, R. K., Wu, R., Khechaduri, A., Jairaj Naik, T., and Ardehali, H. (2012) Disruption of ATP-binding cassette B8 in mice leads to cardiomyopathy through a decrease in mitochondrial iron export. Proc. Natl. Acad. Sci.

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Authors
Ward, D. M., Chen, O. S., Li, L., Kaplan, J., Bhuiyan, S. A., Natarajan, S. K., Bard, M., & Cox, J. E.
Affiliations
  • University of Utah (US)
  • Indiana University – Purdue University Indianapolis (US)
Corresponding author
Ward, Diane M.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2018-07
Volume
293
Issue
27
Pages
10782-10795
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2803587457
Cited by
32
References
69
Citations by year
2026: 2 · 2025: 4 · 2024: 5 · 2023: 4 · 2022: 3 · 2021: 3 · 2020: 4 · 2019: 7
FWCI
1.24
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • IUScholarWorks (Indiana University) (submittedVersion)
  • PMC
Funders
  • HHS | NIH | National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) (DK030534, DK052380, 1S10OD021505, DK110858)
  • Friedreich's Ataxia Research Alliance (FARA) (10047373)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Metalloenzymes and iron-sulfur proteins
Keywords
ergosterol biosynthesis, sterol metabolism, zymosterol, Yfh1, mitochondrial iron metabolism, endoplasmic reticulum, Saccharomyces cerevisiae, respiratory growth, suppressor genes
MeSH terms
Homeostasis, Iron-Sulfur Proteins, Mitochondria, Oxidation-Reduction, Phenotype, Saccharomyces cerevisiae, Sterols, Mitochondrial Proteins, Saccharomyces cerevisiae Proteins

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