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The ribosome-recycling step: consensus or controversy?
Go Hirokawa1, Natalia Demeshkina, Nobuhiro Iwakura
1Department of Microbiology, School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
Trends in Biochemical Sciences
|February 21, 2006
Summary
Ribosome recycling factor (RRF) and elongation factor G (EF-G) split bacterial ribosomes. New findings suggest RRF and EF-G also release tRNA and mRNA, facilitating subsequent translation rounds.
Area of Science:
- Molecular Biology
- Bacterial Protein Synthesis
Background:
- Ribosome recycling is a crucial final step in prokaryotic translation.
- The roles of ribosome recycling factor (RRF) and elongation factor G (EF-G) in subunit dissociation were established in 2005.
- Controversy persists regarding additional functions of RRF and EF-G in ribosome recycling.
Purpose of the Study:
- To investigate the complete functions of RRF and EF-G during prokaryotic ribosome recycling.
- To reconcile existing data on the actions of RRF and EF-G beyond ribosome subunit splitting.
Main Methods:
- Analysis of existing experimental data on RRF and EF-G functions.
- Biochemical and genetic studies of translation termination and ribosome recycling.
Main Results:
- Evidence supports RRF and EF-G mediating ribosome subunit dissociation.
- Data indicate RRF and EF-G are directly involved in releasing deacylated tRNA.
- Findings suggest RRF and EF-G also facilitate mRNA release post-translation.
Conclusions:
- RRF and EF-G possess dual roles in ribosome recycling: subunit splitting and release of translation components.
- These factors are essential for efficient initiation of the next translation cycle.