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C6orf203 is an RNA-binding protein involved in mitochondrial protein synthesis

ABSTRACT: C6orf203 is an RNA-binding protein involved in mitochondrial protein synthesis

PROVIDER: PRJNA551033 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR9602040.fastq.gz	Fastqsanger.gz
	SRR9602041.fastq.gz	Fastqsanger.gz
	SRR9602035.fastq.gz	Fastqsanger.gz
	SRR9602036.fastq.gz	Fastqsanger.gz
	SRR9602037.fastq.gz	Fastqsanger.gz

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C6orf203 is an RNA-binding protein involved in mitochondrial protein synthesis

Project description:In all biological systems, RNAs are associated with RNA-binding proteins (RBPs), forming complexes that control gene regulatory mechanisms, from RNA synthesis to decay. In mammalian mitochondria, post-transcriptional regulation of gene expression is conducted by mitochondrial RBPs (mt-RBPs) at various stages of mt-RNA metabolism, including polycistronic transcript production, its processing into individual transcripts, mt-RNA modifications, stability, translation, and degradation. To date, only a handful of mt-RBPs have been characterized. Here, we describe a putative human mitochondrial protein, C6orf203, that contains an S4-like domain - an evolutionarily conserved RNA-binding domain previously identified in proteins involved in translation. Our data show C6orf203 to bind highly-structured RNA in vitro and associate with the mitoribosomal large subunit in HEK293T cells. Knockout of C6orf203 leads to a decrease in mitochondrial translation and consequent OXPHOS deficiency, without affecting mitochondrial RNA levels. Although mitoribosome stability is not affected in C6orf203-depleted cells, mitoribosome profiling analysis revealed a global disruption of the association of mt-mRNAs with the mitoribosome, suggesting that C6orf203 may be required for the proper maturation and functioning of the mitoribosome. We therefore propose C6orf203 to be a novel RNA-binding protein involved in mitochondrial translation, expanding the repertoire of factors engaged in this process.

2019-08-10 | GSE133315 | GEO

Cardiolipin is required for membrane docking of mitochondrial ribosomes and protein synthesis

Project description:The mitochondrial inner membrane contains a unique phospholipid known as cardiolipin (CL), which stabilises the protein complexes embedded in the membrane and supports its overall structure. Recent evidence indicates that the mitochondrial ribosome may associate with the inner membrane to facilitate co-translational insertion of the hydrophobic oxidative phosphorylation (OXPHOS) proteins into the inner membrane. We generated three mutant knockout cell lines for the cardiolipin biosynthesis gene Crls1 to investigate the effects of cardiolipin loss on mitochondrial protein synthesis. Reduced CL levels caused altered mitochondrial morphology and transcriptome-wide changes that were accompanied by reduced uncoordinated mitochondrial translation rates and impaired respiratory supercomplex formation. Aberrant protein synthesis was caused by impaired formation and distribution of mitochondrial ribosomes. Reduction or loss of cardiolipin resulted in resulted in different mitochondrial and endoplasmic reticulum stress responses. We show that cardiolipin is required to stabilise the interaction of the mitochondrial ribosome with the membrane via its association with OXA1 during active translation. This interaction facilitates insertion of newly synthesised mitochondrial proteins into the inner membrane and stabilises the respiratory supercomplexes.

2020-07-08 | GSE148178 | GEO

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Cardiolipin is required for membrane docking of mitochondrial ribosomes and protein synthesis

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Coordinated regulation of protein synthesis and mitochondrial respiration by the molecular chaperone TRAP1 in cancer cells

Project description:Here we show that TRAP1 directly binds translation elongation factors, both inside and outside mitochondria, and slows down translation. TRAP1 overexpression or silencing affects the synthesis of respiratory complex components. Inside mitochondria, TRAP1 binds the Complex III core component UQCRC2 and regulates Complex III activity. This decreases respiration rate upon basal condition but allows sustained oxidative phosphorylation when glucose is limiting, a condition in which TRAP1-UQCRC2 binding is lost. In humans, TRAP1 is co-expressed with the mitochondrial translational machinery, which synthesize respiratory complex proteins. Altogether, our results show an unprecedented level of complexity in the regulation of cancer cell metabolism, in which mitochondrial and cytosolic protein synthesis are co-regulated with energetic metabolism through the contribution of a common molecular chaperone

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Project description:The mitochondrial matrix is unique in that it must integrate folding and assembly of proteins derived from nuclear and mitochondrial genomes. In C. elegans, the mitochondrial unfolded protein response (UPRmt) senses matrix protein misfolding and induces a program of nuclear gene expression, including mitochondrial chaperonins, to promote mitochondrial proteostasis. While misfolded mitochondrial matrix-localized ornithine trans-carbamylase (OTC) induces chaperonin expression, our understanding of mammalian UPRmt is rudimentary, reflecting a lack of acute triggers for UPRmt activation. This limitation has prevented analysis of the cellular responses to matrix protein misfolding and the effects of UPRmt on mitochondrial translation to control protein folding loads. Here, we combine pharmacological inhibitors of matrix-localized HSP90/TRAP1 or LON protease, which promote chaperonin expression, with global transcriptional and proteomic analysis to reveal an extensive and acute response of human cells to UPRmt. This response involved widespread induction of nuclear genes, including matrix-localized proteins involved in folding, pre-RNA processing and translation. Functional studies revealed rapid but reversible translation inhibition in mitochondria occurring concurrently with defects in pre-RNA processing due to transcriptional repression and LON-dependent turnover of the mitochondrial pre-RNA processing nuclease MRPP3. This study reveals that acute mitochondrial protein folding stress activates both increased chaperone availability within the matrix and reduced matrix-localized protein synthesis through translational inhibition, and provides a framework for further dissection of mammalian UPRmt. triplicate experiment of 3 conditions (untreated, GTPP treatment, CDDO treatment)

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Mitochondrial unfolded protein response controls matrix pre-RNA processing and translation

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LARP4 Is an RNA-Binding Protein That Binds Nuclear-Encoded Mitochondrial mRNAs To Promote Mitochondrial Function

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