LRPPRC-mediated folding of the mitochondrial transcriptome

Stefan J. Siira, Henrik Spåhr, Anne Marie J. Shearwood, Benedetta Ruzzenente, Nils Göran Larsson, Oliver Rackham, Aleksandra Filipovska

Research output: Contribution to journalArticlepeer-review

78 Citations (Scopus)

Abstract

The expression of the compact mammalian mitochondrial genome requires transcription, RNA processing, translation and RNA decay, much like the more complex chromosomal systems, and here we use it as a model system to understand the fundamental aspects of gene expression. Here we combine RNase footprinting with PAR-CLIP at unprecedented depth to reveal the importance of RNA-protein interactions in dictating RNA folding within the mitochondrial transcriptome. We show that LRPPRC, in complex with its protein partner SLIRP, binds throughout the mitochondrial transcriptome, with a preference for mRNAs, and its loss affects the entire secondary structure and stability of the transcriptome. We demonstrate that the LRPPRC-SLIRP complex is a global RNA chaperone that stabilizes RNA structures to expose the required sites for translation, stabilization, and polyadenylation. Our findings reveal a general mechanism where extensive RNA-protein interactions ensure that RNA is accessible for its biological functions.

Original languageEnglish
Article number1532
JournalNature Communications
Volume8
Issue number1
DOIs
Publication statusPublished - 1 Dec 2017

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