Cited by 141Iron Metabolism and DisordersRNA and protein synthesis mechanismsNeurological diseases and metabolism

Identification of a conserved and functional iron-responsive element in the 5'-untranslated region of mammalian mitochondrial aconitase

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Kim, Hae-Yeong, LaVaute, Timothy, Iwai, Kazuhiro, Klausner, Richard D., Rouault, Tracey A.·1996·Journal of Biological Chemistry

Abstract

Iron-responsive elements (IREs) are RNA stem-loop motifs found in genes of iron metabolism. When cells are iron-depleted, iron regulatory proteins (IRPs) bind to IREs in the transcripts of ferritin, transferrin receptor, and erythroid amino-levulinic acid synthetase. Binding of IRPs to IRE motifs near the 5' end of the transcript results in attenuation of translation while binding to IREs in the 3'-untranslated region of the transferrin receptor results in protection from endonucleolytic cleavage. Iron deprivation results in activation of IRE binding activity, whereas iron replete cells lose IRE binding activation. Here, we report the identification of a conserved IRE in the 5'-untranslated region of the transcript of the citric acid cycle enzyme mitochondrial aconitase from four different mammalian species. The IRE in the transcript of mitochondrial aconitase can mediate in vitro translational repression of mitochondrial aconitase by IRPs. Furthermore, levels of mitochondrial aconitase are decreased in mice maintained on a low iron diet, whereas levels of mRNA remain unchanged. The decrease in levels of mitochondrial aconitase is likely due to activation of IRP binding and consequent attenuation of translation. Thus, expression of the iron-sulfur protein mitochondrial aconitase and function of the citric acid cycle may be regulated by iron levels in cells.

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  • The 5′ end of ACO2 contains a conserved IRE, likely responsible for reduced ACO2 protein expression in mice on a low iron diet.

    “The 5′ end of ACO2 contains a conserved IRE, which is likely responsible for the reduction in ACO2 protein expression observed in mice maintained on a low iron diet (152).”

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Research works printed but not linked: 5

  1. Kaptain, S., Downey, W. E., Tang, C., Philpott, C. C., Haile, D. J., Orloff, D. G., Harford, J. B., Rouault, T. A. & Klausner, R. D. (1991) Proc. Natl. Acad. Sci.
  2. Haile, D. J., Rouault, T. A., Tang, C. K., Chin, J., Harford, J. B. & Klausner, R. D. (1992) Proc. Natl. Acad. Sci. U. S. A. 89, 7536 -7540
  3. Kennedy, M. C., Mende-Mueller, L., Blondin, G. A. & Beinert, H. (1992) Proc. Natl. Acad. Sci. U. S. A. 89, 11730 -11734
  4. Tam, J. P. (1988) Proc. Natl. Acad. Sci. U. S. A. 85, 5409 -5413
  5. Rouault, T. A., and Klausner, R. D. (1996) Curr. Top. Cell. Regul. 35, in press

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Authors
Kim, H.-Y., LaVaute, T., Iwai, K., Klausner, R. D., & Rouault, T. A.
Affiliations
National Institutes of Health (US)
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1996-09
Volume
271
Issue
39
Pages
24226-24230
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2040420376
Cited by
141
References
25
Citations by year
2025: 1 · 2024: 3 · 2023: 2 · 2022: 7 · 2021: 7 · 2020: 5 · 2019: 4 · 2018: 1 · 2017: 3 · 2016: 1 · 2015: 2 · 2014: 4 · 2012: 2
FWCI
5.20
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Hematology › Iron Metabolism and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
  • Life Sciences › Neuroscience › Neurology › Neurological diseases and metabolism
Keywords
iron-responsive element, iron regulatory proteins, mitochondrial aconitase, 5' untranslated region, protein synthesis inhibition, iron metabolism, iron-sulfur proteins, TCA cycle, low-iron diet
MeSH terms
Aconitate Hydratase, Animals, Binding, Competitive, Cattle, Humans, Iron, Iron-Sulfur Proteins, Mitochondria, Repressor Proteins, RNA, Messenger, Swine, Protein Biosynthesis, Gene Expression Regulation, Enzymologic, Consensus Sequence, RNA-Binding Proteins, Iron-Regulatory Proteins, Mice

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