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Translational regulation in vivo of the Drosophila melanogaster mRNA encoding succinate dehydrogenase iron protein
1Department of Cell and Molecular Biology, Karolinska Insitute, Stockholm, Sweden.
Abstract:
Some mRNA encoding proteins related to iron metabolism contain a specific stem-loop structure--iron responsive element (IRE)-in the 5' UTR. Binding of the iron regulatory protein (IRP) to the IRE, in response to decreases in cellular iron levels, leads to a block in translation of these mRNAs. We here describe the drosophila melanogaster succinate dehydrogenase iron protein (SDH-IP) as a fourth example of an mRNA species being translationally regulated by an IRE, based on iron dependent regulation of SDH-IP translation in vivo by immunoprecipitations and northern blotting in drosophila cell lines. Addition of hemin to the drosophila cells lead to fragmentation of the SDH-IP, which might suggest additional mode to specifically down-regulate the expression of this protein and Krebs cycle function.
Insights
Iron regulatory proteins (IRPs) control gene expression via iron responsive elements (IREs). This study identifies succinate dehydrogenase iron protein (SDH-IP) mRNA in Drosophila as a novel IRE-regulated transcript, impacting iron metabolism.
Area of Science:
- Molecular Biology
- Gene Regulation
- Iron Metabolism
Background:
- Iron metabolism is crucial for cellular function.
- Specific mRNAs contain iron-responsive elements (IREs) in their 5' untranslated regions.
- Iron regulatory proteins (IRPs) bind to IREs, modulating translation in response to cellular iron levels.
Purpose of the Study:
- To investigate the translational regulation of Drosophila melanogaster succinate dehydrogenase iron protein (SDH-IP) mRNA by IREs.
- To identify SDH-IP as a novel IRE-regulated mRNA species.
Main Methods:
- Utilized Drosophila cell lines for experiments.
- Employed immunoprecipitation and northern blotting techniques.
- Analyzed iron-dependent regulation of SDH-IP translation in vivo.
Main Results:
- Confirmed iron-dependent translational regulation of SDH-IP mRNA by an IRE.
- Identified SDH-IP mRNA as the fourth known IRE-regulated transcript.
- Observed hemin-induced fragmentation of SDH-IP, suggesting additional regulatory mechanisms.
Conclusions:
- Drosophila SDH-IP is translationally regulated by the IRE-IRP system.
- This regulation impacts iron metabolism and potentially Krebs cycle function.
- Hemin may induce specific downregulation of SDH-IP expression through novel mechanisms.