Cited by 171Mitochondrial Function and PathologyIron Metabolism and DisordersNeurological diseases and metabolism

Deletion of the Mitochondrial Carrier Genes MRS3 andMRS4 Suppresses Mitochondrial Iron Accumulation in a Yeast Frataxin-deficient Strain

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Foury, Françoise, Roganti, Tiziana·2002·Journal of Biological Chemistry

Abstract

The mitochondrial solute carriers Mrs3p and Mrs4p were originally isolated as multicopy suppressors of intron splicing defects. We show here that MRS4 is co-regulated with the iron regulon genes, and up-regulated in a strain deficient for Yfh1p, the yeast homologue of human frataxin. Using in vivo 55Fe cell radiolabeling we show that in glucose-grown cells mitochondrial iron accumulation is 5-15 times higher in deltaYFH1 than in wild-type strain. However, although in a deltaYFH1deltaMRS3deltaMRS4 strain, the intracellular 55Fe content is extremely high, the mitochondrial iron concentration is decreased to almost wild-type levels. Moreover, deltaYFH1deltaMRS3deltaMRS4 cells grown in high iron media do not lose their mitochondrial genome. Conversely, a deltaYFH1 strain overexpressing MRS4 has an increased mitochondrial iron content and no mitochondrial genome. Therefore, MRS4 is required for mitochondrial iron accumulation in deltaYFH1 cells. Expression of the iron regulon and intracellular 55Fe content are higher in a deltaMRS3deltaMRS4 strain than in the wild type. Nevertheless, the mitochondrial 55Fe content, a balance between iron uptake and exit, is decreased by a factor of two. Moreover, 55Fe incorporation into heme by ferrochelatase is increased in an MRS4-overexpressing strain. The function of MRS4 in iron import into mitochondria is discussed.

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Crossref · 10.1074/jbc.m111789200

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Authors
Foury, F., & Roganti, T.
Affiliations
UCLouvain (BE)
Corresponding author
Foury, Françoise
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2002-07
Volume
277
Issue
27
Pages
24475-24483
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2035410822
Cited by
171
References
34
Citations by year
2026: 2 · 2025: 5 · 2024: 2 · 2023: 4 · 2022: 5 · 2021: 6 · 2020: 7 · 2019: 10 · 2018: 7 · 2017: 7 · 2016: 4 · 2015: 8 · 2014: 12 · 2013: 10 · 2012: 5
FWCI
3.59
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Digital Access to Libraries (Université catholique de Louvain (UCL), l'Université de Namur (UNamur) and the Université Saint-Louis (USL-B)) (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Health Sciences › Medicine › Hematology › Iron Metabolism and Disorders
  • Life Sciences › Neuroscience › Neurology › Neurological diseases and metabolism
Keywords
mitochondrial carrier protein, mitochondrial iron accumulation, frataxin, iron regulon, mitochondrial genome stability, heme biosynthesis, ferrochelatase, Saccharomyces cerevisiae
MeSH terms
Frataxin, Base Sequence, Carrier Proteins, Cell Division, DNA, Mitochondrial, Fungal Proteins, Kinetics, Mitochondria, Repressor Proteins, Saccharomyces cerevisiae, Suppression, Genetic, Genome, Fungal, Gene Deletion, Phosphotransferases (Alcohol Group Acceptor), DNA Primers, Mitochondrial Proteins, Cation Transport Proteins, Saccharomyces cerevisiae Proteins, Iron-Binding Proteins

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