| Autor: |
Chung J; From the Division of Hematology, Brigham and Women's Hospital; Division of Hematology-Oncology, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts 02115., Anderson SA, Gwynn B, Deck KM, Chen MJ, Langer NB, Shaw GC, Huston NC, Boyer LF, Datta S, Paradkar PN, Li L, Wei Z, Lambert AJ, Sahr K, Wittig JG, Chen W, Lu W, Galy B, Schlaeger TM, Hentze MW, Ward DM, Kaplan J, Eisenstein RS, Peters LL, Paw BH |
| Jazyk: |
angličtina |
| Zdroj: |
The Journal of biological chemistry [J Biol Chem] 2014 Mar 14; Vol. 289 (11), pp. 7835-43. Date of Electronic Publication: 2014 Feb 07. |
| DOI: |
10.1074/jbc.M114.547778 |
| Abstrakt: |
Mitochondrial iron is essential for the biosynthesis of heme and iron-sulfur ([Fe-S]) clusters in mammalian cells. In developing erythrocytes, iron is imported into the mitochondria by MFRN1 (mitoferrin-1, SLC25A37). Although loss of MFRN1 in zebrafish and mice leads to profound anemia, mutant animals showed no overt signs of porphyria, suggesting that mitochondrial iron deficiency does not result in an accumulation of protoporphyrins. Here, we developed a gene trap model to provide in vitro and in vivo evidence that iron regulatory protein-1 (IRP1) inhibits protoporphyrin accumulation. Mfrn1(+/gt);Irp1(-/-) erythroid cells exhibit a significant increase in protoporphyrin levels. IRP1 attenuates protoporphyrin biosynthesis by binding to the 5'-iron response element (IRE) of alas2 mRNA, inhibiting its translation. Ectopic expression of alas2 harboring a mutant IRE, preventing IRP1 binding, in Mfrn1(gt/gt) cells mimics Irp1 deficiency. Together, our data support a model whereby impaired mitochondrial [Fe-S] cluster biogenesis in Mfrn1(gt/gt) cells results in elevated IRP1 RNA-binding that attenuates ALAS2 mRNA translation and protoporphyrin accumulation. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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