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Transcriptome-wide view of endosomal mRNP transport [iCLIP ]

ABSTRACT: Transcriptome-wide view of endosomal mRNP transport [iCLIP ]

PROVIDER: PRJNA431398 | ENA |

REPOSITORIES: ENA

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Dataset's files

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			Action	DRS
	SRR6506370.fastq.gz	Fastqsanger.gz
	SRR6506371.fastq.gz	Fastqsanger.gz
	SRR6506372.fastq.gz	Fastqsanger.gz
	SRR6506373.fastq.gz	Fastqsanger.gz
	SRR6506374.fastq.gz	Fastqsanger.gz

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Transcriptome-wide view of endosomal mRNP transport [iCLIP ]

Project description:Spatiotemporal protein expression is mediated by active transport and local translation of mRNAs. Key factors of the transport machinery are RNA-binding proteins (RBPs) that recognise mRNAs as cargo for motor-based transport. However, a global view of transported mRNAs with cognate RBP binding sites is missing. Here, we cast a transcriptome-wide view on endosomal mRNP transport in Ustilago maydis by studying the newly identified endosomal RBP Grp1 and the key transport RBP Rrm4 in a comparative iCLIP approach. This uncovered thousand of cargo mRNAs bound by both RBPs.

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Transcriptome-wide view of endosomal mRNP transport [RNA-Seq]

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Project description:Transcriptome-wide view of endosomal mRNP transport

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Transcriptome-wide view of endosomal mRNP transport

Project description:This SuperSeries is composed of the SubSeries listed below.

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Project description:In the associated paper FXR1 is shown to package exceptionally long mRNAs in the cytoplasm and organizes them into an mRNP network. We performed iCLIP of FXR-WT and its mutant FXR1-V361P in HeLa cells where we knocked down endogenous FXR1 and replaced it with either GFP-tagged WT or V361P-mutant FXR1. The GFP-tagged proteins were immunoprecipitated using an anti-GFP antibody.

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USP32 regulates late endosomal transport and recycling through deubiquitylation of Rab7

Project description:The endosomal system is a highly dynamic multifunctional organelle, whose complexity is regulated in part by reversible ubiquitylation. Despite the wide-ranging influence of ubiquitin in endosomal processes, relatively few enzymes utilizing ubiquitin have been described to control endosome integrity and function. Here we reveal the deubiquitylating enzyme (DUB) ubiquitin-specific protease 32 (USP32) as a powerful new player in this context. Loss of USP32 inhibits late endosome (LE) transport and recycling of LE cargos to the TGN, resulting in dispersion and swelling of the late compartment. Using SILAC-based ubiquitome profiling we identify the small GTPase Rab7—the logistical centerpiece of LE biology—as a substrate of USP32. Mechanistic studies reveal that LE transport effector RILP prefers ubiquitylation-deficient Rab7, while retromer-mediated LE recycling benefits from an intact cycle of Rab7 ubiquitylation. Collectively, our observations suggest that reversible ubiquitylation helps switch Rab7 between its various functions, thereby maintaining global spatiotemporal order in the endosomal system.

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Project description:A key function for RNA-binding proteins in orchestrating plant development and environmental responses is well established. However, the lack of a genome-wide view on their in vivo binding targets and binding landscapes represents a gap in understanding the mode of action of plant RNA-binding proteins. Here, we adapt individual nucleotide resolution crosslinking immunoprecipitation (iCLIP) for genome-wide determining the binding repertoire of the circadian clock-regulated Arabidopsis thaliana glycine-rich RNA-binding protein AtGRP7. We have established iCLIP for plants to identify target transcripts of the RNA-binding protein AtGRP7. This paves the way to investigate the dynamics of posttranscriptional networks in response to exogenous and endogenous cues.

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The key protein of endosomal mRNP transport Rrm4 binds translational landmark sites of cargo mRNAs.

Project description:RNA-binding proteins (RBPs) determine spatiotemporal gene expression by mediating active transport and local translation of cargo mRNAs. Here, we cast a transcriptome-wide view on the transported mRNAs and cognate RBP binding sites during endosomal messenger ribonucleoprotein (mRNP) transport in Ustilago maydis Using individual-nucleotide resolution UV crosslinking and immunoprecipitation (iCLIP), we compare the key transport RBP Rrm4 and the newly identified endosomal mRNP component Grp1 that is crucial to coordinate hyphal growth. Both RBPs bind predominantly in the 3' untranslated region of thousands of shared cargo mRNAs, often in close proximity. Intriguingly, Rrm4 precisely binds at stop codons, which constitute landmark sites of translation, suggesting an intimate connection of mRNA transport and translation. Towards uncovering the code of recognition, we identify UAUG as specific binding motif of Rrm4 that is bound by its third RRM domain. Altogether, we provide first insights into the positional organisation of co-localising RBPs on individual cargo mRNAs.

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