1
|
Giess A, Torres Cleuren YN, Tjeldnes H, Krause M, Bizuayehu TT, Hiensch S, Okon A, Wagner CR, Valen E. Profiling of Small Ribosomal Subunits Reveals Modes and Regulation of Translation Initiation. Cell Rep 2021; 31:107534. [PMID: 32320657 DOI: 10.1016/j.celrep.2020.107534] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 02/28/2020] [Accepted: 03/27/2020] [Indexed: 12/11/2022] Open
Abstract
Translation initiation is often attributed as the rate-determining step of eukaryotic protein synthesis and key to gene expression control. Despite this centrality, the series of steps involved in this process is poorly understood. Here, we capture the transcriptome-wide occupancy of ribosomes across all stages of translation initiation, enabling us to characterize the transcriptome-wide dynamics of ribosome recruitment to mRNAs, scanning across 5' UTRs and stop codon recognition, in a higher eukaryote. We provide mechanistic evidence for ribosomes attaching to the mRNA by threading the mRNA through the small subunit. Moreover, we identify features that regulate the recruitment and processivity of scanning ribosomes and redefine optimal initiation contexts. Our approach enables deconvoluting translation initiation into separate stages and identifying regulators at each step.
Collapse
Affiliation(s)
- Adam Giess
- Computational Biology Unit, Department of Informatics, University of Bergen, Bergen 5020, Norway
| | - Yamila N Torres Cleuren
- Computational Biology Unit, Department of Informatics, University of Bergen, Bergen 5020, Norway.
| | - Håkon Tjeldnes
- Computational Biology Unit, Department of Informatics, University of Bergen, Bergen 5020, Norway
| | - Maximilian Krause
- Computational Biology Unit, Department of Informatics, University of Bergen, Bergen 5020, Norway; Sars International Centre for Marine Molecular Biology, University of Bergen, Bergen 5008, Norway
| | | | - Senna Hiensch
- Sars International Centre for Marine Molecular Biology, University of Bergen, Bergen 5008, Norway
| | - Aniekan Okon
- Department Medicinal Chemistry, University of Minnesota, Minneapolis, MN 55455, USA
| | - Carston R Wagner
- Department Medicinal Chemistry, University of Minnesota, Minneapolis, MN 55455, USA
| | - Eivind Valen
- Computational Biology Unit, Department of Informatics, University of Bergen, Bergen 5020, Norway; Sars International Centre for Marine Molecular Biology, University of Bergen, Bergen 5008, Norway.
| |
Collapse
|