Biogenesis of cytosolic ribosomes requires the essential iron–sulphur protein Rli1p and mitochondria

Kispal, Gyula, Sipos, Katalin, Lange, Heike, Fekete, Zsuzsanna, Bedekovics, Tibor, Janáky, Tamás, Bassler, Jochen, Aguilar Netz, Daili J., Balk, Janneke, Rotte, Carmen and Lill, Roland (2005) Biogenesis of cytosolic ribosomes requires the essential iron–sulphur protein Rli1p and mitochondria. The EMBO Journal, 24 (3). pp. 589-598. ISSN 0261-4189

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Abstract

Mitochondria perform a central function in the biogenesis of cellular iron–sulphur (Fe/S) proteins. It is unknown to date why this biosynthetic pathway is indispensable for life, the more so as no essential mitochondrial Fe/S proteins are known. Here, we show that the soluble ATP-binding cassette (ABC) protein Rli1p carries N-terminal Fe/S clusters that require the mitochondrial and cytosolic Fe/S protein biogenesis machineries for assembly. Mutations in critical cysteine residues of Rli1p abolish association with Fe/S clusters and lead to loss of cell viability. Hence, the essential character of Fe/S clusters in Rli1p explains the indispensable character of mitochondria in eukaryotes. We further report that Rli1p is associated with ribosomes and with Hcr1p, a protein involved in rRNA processing and translation initiation. Depletion of Rli1p causes a nuclear export defect of the small and large ribosomal subunits and subsequently a translational arrest. Thus, ribosome biogenesis and function are intimately linked to the crucial role of mitochondria in the maturation of the essential Fe/S protein Rli1p.

Item Type: Article
Faculty \ School: Faculty of Science > School of Biological Sciences
Depositing User: Rhiannon Harvey
Date Deposited: 07 Feb 2012 14:46
Last Modified: 21 Apr 2020 19:57
URI: https://ueaeprints.uea.ac.uk/id/eprint/36903
DOI: 10.1038/sj.emboj.7600541

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