Dataset Information

FRIENDLY (FMT) is an RNA binding protein associated with cytosolic ribosomes at the mitochondrial surface

ABSTRACT: The spatial organization of protein synthesis in the eukaryotic cell is essential for maintaining the integrity of the proteome and the functioning of the cell. Translation on free polysomes or on ribosomes associated with the endoplasmic reticulum has been studied for a long time. More recent data have revealed selective translation of mRNAs in other compartments, in particular at the surface of mitochondria. Although these processes have been described in many organisms, in particular in plants, the mRNA targeting and localized translation mechanisms remain poorly understood. Here, the Arabidopsis thaliana Friendly (FMT) protein is shown to be a cytosolic RNA binding protein that associates with cytosolic ribosomes at the surface of mitochondria. As previously shown (El Zawily et al., 2014), FMT knock-out delays seedling development and causes mitochondrial clustering. The mutation also disrupts the mitochondrial proteome, and the localization of nuclear transcripts encoding mitochondrial proteins at the surface of mitochondria. These data indicate that FMT participates in the localization of mRNAs and their translation at the surface of mitochondria.

INSTRUMENT(S): Q Exactive

ORGANISM(S): Arabidopsis Thaliana (mouse-ear Cress)

TISSUE(S): Flower, Whole Body

SUBMITTER: Johana Chicher

LAB HEAD: Anne-Marie Duchêne

PROVIDER: PXD035707 | Pride | 2023-02-06

REPOSITORIES: Pride

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Dataset's files

Source:

			Action	DRS
	2018_S48_AMDuchene-MHaemono_Am1_1000ng.mgf	Mgf
	2018_S48_AMDuchene-MHaemono_Am1_1000ng.raw	Raw
	2018_S48_AMDuchene-MHaemono_Am2_1000ng.mgf	Mgf
	2018_S48_AMDuchene-MHaemono_Am2_1000ng.raw	Raw
	2018_S48_AMDuchene-MHaemono_Am3_1000ng.mgf	Mgf

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FRIENDLY (FMT) is an RNA binding protein associated with cytosolic ribosomes at the mitochondrial surface.

Hemono Mickaele M Salinas-Giegé Thalia T Roignant Jeanne J Vingadassalon Audrey A Hammann Philippe P Ubrig Elodie E Ngondo Patryk P Duchêne Anne-Marie AM

The Plant journal : for cell and molecular biology 20220912 2

The spatial organization of protein synthesis in the eukaryotic cell is essential for maintaining the integrity of the proteome and the functioning of the cell. Translation on free polysomes or on ribosomes associated with the endoplasmic reticulum has been studied for a long time. More recent data have revealed selective translation of mRNAs in other compartments, in particular at the surface of mitochondria. Although these processes have been described in many organisms, particularky in plants ...[more]

PMID: 36050837

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Project description:MicroRNAs (miRNAs) are small non-coding RNAs that associate with Argonaute 2 protein to regulate gene expression at the post-transcriptional level in the cytoplasm. However, recent studies have reported that some miRNAs localize to and function in other cellular compartments. Mitochondria harbour their own genetic system that may be a potential site for miRNA-mediated post-transcriptional regulation. We aimed at investigating whether nuclear-encoded miRNAs can localize to and function in human mitochondria. To enable identification of mitochondrial-enriched miRNAs, we profiled the mitochondrial and cytosolic RNA fractions from the same HeLa cells by miRNA microarray analysis. Mitochondria were purified using a combination of cell fractionation and immunoisolation, and assessed for the lack of protein and RNA contaminants. We found 57 miRNAs differentially expressed in HeLa mitochondria and cytosol. Of these 57, a signature of 13 nuclear-encoded miRNAs was reproducibly enriched in mitochondrial RNA and validated by RT-PCR for hsa-miR-494, hsa-miR-1275 and hsa-miR-1974. This study provides the first comprehensive view of the localization of RNA interference components to the mitochondria. Our data outline the molecular bases for a novel layer of crosstalk between nucleus and mitochondria through a specific subset of human miRNAs that we termed ‘mitomiRs’. To assess whether nuclear-encoded miRNA are detectable in human mitochondria, we performed the following four steps approach. First, cultured HeLa cells were allowed to reach 80-100% confluence and subjected to fractionation in order to isolate the cytosolic fraction. From the same HeLa cells, mitochondria were isolated by immunomagnetic Anti-TOM22 MicroBeads from the Mitochondria Isolation Kit (Miltenyi Biotec). In total, six mitochondria preparations were perfromed, three of these were additionally treated with RNase A. Second, total RNA was extracted from the mitochondrial and cytosolic fractions. Third, mitochondrial and cytosolic RNA were respectively profiled by microRNA microarray analysis. Last, data were analyzed and normalized.Three independent assays were performed.