Cited by 165Metalloenzymes and iron-sulfur proteinsMitochondrial Function and PathologyIron Metabolism and Disorders

Role of human mitochondrial Nfs1 in cytosolic iron-sulfur protein biogenesis and iron regulation

Biederbick, Annette, Stehling, Oliver, Rösser, Ralf, Niggemeyer, Brigitte, Nakai, Yumi, Elsässer, Hans-Peter, Lill, Roland·2006·Molecular and Cellular Biology

Abstract

The biogenesis of iron-sulfur (Fe/S) proteins in eukaryotes is a complex process involving more than 20 components. So far, functional investigations have mainly been performed in Saccharomyces cerevisiae. Here, we have analyzed the role of the human cysteine desulfurase Nfs1 (huNfs1), which serves as a sulfur donor in biogenesis. The protein is located predominantly in mitochondria, but small amounts are present in the cytosol/nucleus. huNfs1 was depleted efficiently in HeLa cells by a small interfering RNA (siRNA) approach, resulting in a drastic growth retardation and striking morphological changes of mitochondria. The activities of both mitochondrial and cytosolic Fe/S proteins were strongly impaired, demonstrating that huNfs1 performs an essential function in Fe/S protein biogenesis in human cells. Expression of murine Nfs1 (muNfs1) in huNfs1-depleted cells restored both growth and Fe/S protein activities to wild-type levels, indicating the specificity of the siRNA depletion approach. No complementation of the growth retardation was observed, when muNfs1 was synthesized without its mitochondrial presequence. This extramitochondrial muNfs1 did not support maintenance of Fe/S protein activities, neither in the cytosol nor in mitochondria. In conclusion, our study shows that the essential huNfs1 is required inside mitochondria for efficient maturation of cellular Fe/S proteins. The results have implications for the regulation of iron homeostasis by cytosolic iron regulatory protein 1.

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Crossref · 10.1128/mcb.00112-06

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Authors
Biederbick, A., Stehling, O., Rösser, R., Niggemeyer, B., Nakai, Y., Elsässer, H.-P., & Lill, R.
Affiliations
  • Philipps University of Marburg (DE)
  • Institut für Zytobiologie, Philipps Universität Marburg
  • Osaka Medical and Pharmaceutical University (JP)
Corresponding author
Lill, Roland
Venue
Molecular and Cellular Biology
Published
2006-08-01
Volume
26
Issue
15
Pages
5675-5687
ISSN
  • 0270-7306 (ISSN-L)
  • 1098-5549
OpenAlex
W2143602831
Cited by
164
References
56
Citations by year
2026: 1 · 2025: 5 · 2024: 3 · 2023: 4 · 2022: 7 · 2021: 10 · 2020: 10 · 2019: 6 · 2018: 12 · 2017: 14 · 2016: 6 · 2015: 7 · 2014: 10 · 2013: 14 · 2012: 9
FWCI
7.75
Type
journal article
Language
en
Open access
closed
Locations
  • Molecular and Cellular Biology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Metalloenzymes and iron-sulfur proteins
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Health Sciences › Medicine › Hematology › Iron Metabolism and Disorders
Keywords
NFS1, cysteine desulfurase, mitochondrial iron-sulfur proteins, iron homeostasis, iron regulatory protein 1, mitochondrial morphology, human cells, mitochondrial presequence
MeSH terms
Amino Acid Sequence, Animals, Cytosol, Genetic Vectors, HeLa Cells, Homeostasis, Humans, Iron, Iron-Sulfur Proteins, Mitochondria, Molecular Sequence Data, Carbon-Sulfur Lyases, Sulfurtransferases, Sequence Alignment, Mitochondrial Proteins, Saccharomyces cerevisiae Proteins, RNA, Small Interfering, Mice

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