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TCP-seq of yeast initiation factor mutants

ABSTRACT: TCP-seq of yeast initiation factor mutants

PROVIDER: PRJNA514031 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR8424250.fastq.gz	Fastqsanger.gz
	SRR8424260.fastq.gz	Fastqsanger.gz
	SRR8424270.fastq.gz	Fastqsanger.gz
	SRR8424251.fastq.gz	Fastqsanger.gz
	SRR8424261.fastq.gz	Fastqsanger.gz

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Selective Translation Complex Profiling in yeast and human Reveals Staged Initiation and Co-translational Assembly of Initiation Factor Complexes [Yeast]

Project description:Translational control targeting mainly the initiation phase is central to the regulation of gene expression. Understanding all of its aspects requires substantial technological advancements. Here we modified yeast Translational Complex Profile sequencing (TCP-seq), related to ribosome profiling, and adopted it for mammalian cells. Human TCP-seq, capable of capturing footprints of 40S subunits (40Ses) in addition to 80S ribosomes (80Ses), revealed that mammalian and yeast 40Ses distribute similarly across 5’UTRs indicating considerable evolutionary conservation. We further developed a variation called Selective TCP-seq (Sel-TCP-seq) enabling selection for 40Ses and 80Ses associated with an immuno-targeted factor in yeast and human. Sel- TCP-seq demonstrated that eIF2 and eIF3 travel along 5’UTRs with scanning 40Ses to successively dissociate upon start codon recognition. Manifesting the Sel-TCP-seq versatility for gene expression studies, we also identified four initiating 48S conformational intermediates, provided novel insights into ATF4 and GCN4 mRNA translational control, and demonstrated co-translational assembly of initiation factor complexes.

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Project description:Start codon recognition by the 48S complex is a critical step in translation. However, understanding the in vivo initiation and its regulation at a global scale is limited. Here, we analyzed translation complex profiling (TCP-seq) data to determine the impact of eIF4G1-eIF1 inhibition and the 48S organization. Our analysis provides the first global view of leaky scanning and reveal the central roles of mRNA features and eIF4G1-eIF1 in its regulation. Specifically, non-leaky genes are enriched with a Kozak bearing a C at -1 position while those with short 5’ UTR with TISU. Additionally, the stability of the 48S complex and its integrity during scanning are impaired upon eIF4G1-eIF1 inhibition. Detailed analysis of initiation site footprints revealed three main classes conserved from yeast to human. Our analysis provides a general overview of AUG selection and evidence for conformational rearrangements in vivo.

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