Cited by 143Mitochondrial Function and PathologyTrace Elements in HealthMetal-Catalyzed Oxygenation Mechanisms

The Effects of Mitochondrial Iron Homeostasis on Cofactor Specificity of Superoxide Dismutase 2

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Yang, Mei, Cobine, Paul A, Molik, Sabine, Naranuntarat, Amornrat, Lill, Roland, Winge, Dennis R, Culotta, Valeria C·2006·The EMBO Journal

Abstract

Many metalloproteins have the capacity to bind diverse metals, but in living cells connect only with their cognate metal cofactor. In eukaryotes, this metal specificity can be achieved through metal-specific metallochaperone proteins. Herein, we describe a mechanism whereby Saccharomyces cerevisiae manganese superoxide dismutase (SOD2) preferentially binds manganese over iron based on the differential bioavailability of these ions within mitochondria. The bulk of mitochondrial iron is normally unavailable to SOD2, but when mitochondrial iron homeostasis is disrupted, for example, by mutations in S. cerevisiae mtm1, ssq1 and grx5, iron accumulates in a reactive form that potently competes with manganese for binding to SOD2, inactivating the enzyme. Studies in mtm1 mutants indicate that iron inactivation of SOD2 involves the Mrs3p/Mrs4p mitochondrial carriers and iron-binding frataxin (Yfh1p). A small pool of SOD2-reactive iron also exists under normal iron homeostasis conditions and binds SOD2 when mitochondrial manganese is low. The ability to control this reactive pool of iron is critical to maintaining SOD2 activity and has important potential implications for oxidative stress in disorders of iron overload.

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Authors
Yang, M., Cobine, P. A., Molik, S., Naranuntarat, A., Lill, R., Winge, D. R., & Culotta, V. C.
Affiliations
  • Johns Hopkins University (US)
  • University of Utah (US)
  • Philipps University of Marburg (DE)
Corresponding author
Culotta, Valeria C
Venue
The EMBO Journal
Published
2006-04-06
Volume
25
Issue
8
Pages
1775-1783
ISSN
  • 0261-4189 (ISSN-L)
  • 1460-2075
OpenAlex
W2137209776
Cited by
143
References
64
Citations by year
2026: 1 · 2025: 1 · 2024: 5 · 2023: 2 · 2022: 10 · 2021: 6 · 2020: 5 · 2019: 3 · 2018: 3 · 2017: 10 · 2016: 3 · 2015: 6 · 2014: 10 · 2013: 9 · 2012: 7
FWCI
5.30
Type
journal article
Language
en
Open access
Locations
  • The EMBO Journal (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Deutsche Forschungsgemeinschaft (SFB593)
  • National Institutes of Health
  • Leibniz-Gemeinschaft
  • National Cancer Institute (CA 61286, R01CA061286)
  • National Institute of General Medical Sciences (F32GM074402)
  • National Institute of Environmental Health Sciences (ES 07141, R01ES008996, ES08996, T32ES007141)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Health Sciences › Nursing › Nutrition and Dietetics › Trace Elements in Health
  • Physical Sciences › Chemistry › Inorganic Chemistry › Metal-Catalyzed Oxygenation Mechanisms
Keywords
manganese superoxide dismutase, mitochondrial iron homeostasis, cofactor specificity, metallochaperone, reactive iron, iron overload, oxidative stress, MTM1, frataxin, Saccharomyces cerevisiae
MeSH terms
Frataxin, Superoxide Dismutase 2, Enzyme Activation, Homeostasis, Iron, Manganese, Mitochondria, Mutation, Saccharomyces cerevisiae, Superoxide Dismutase, Transcription Factors, Mitochondrial Proteins, Cation Transport Proteins, Saccharomyces cerevisiae Proteins, Iron-Binding Proteins

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