ArticleNucleic acids research2025
Ribosomal expansion segment contributes to translation fidelity via N-terminal processing of ribosomal proteins.
Article in Nucleic acids research, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- A Stage-Dependent Translational Signature in Peripheral Blood Mononuclear Cells from Clinically Isolated Syndrome to Relapsing-Remitting Multiple Sclerosis: An Exploratory Cross-Sectional Study.International journal of molecular sciences · 2026Article
- RPL41 stabilizes ribosome dynamics and supports long-protein homeostasis in mammals.Nucleic acids research · 2026Article
- Amino acid balancing and microalgal proteins (Spirulina) improve production performance and milk quality in dairy cows under low-protein diets.NPJ science of food · 2026Article
- Ribosome heterogeneity arising from common and rare rRNA sequence variants affects diverse human phenotypes.medRxiv : the preprint server for health sciences · 2025Article
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Authors and funding
9 authors.
Funding
Abstract
Eukaryotic ribosomes exhibit higher mRNA translation fidelity than prokaryotic ribosomes, partly due to eukaryote-specific ribosomal RNA (rRNA) insertions. Among these, expansion segment 27L (ES27L) on the 60S subunit enhances fidelity by anchoring methionine aminopeptidase (MetAP) at the nascent protein exit tunnel, accelerating co-translational N-terminal initiator methionine (iMet) processing. However, the mechanisms by which iMet processing influences translation fidelity remain unknown. Using yeast in vitro translation (IVT) systems, we found that inhibiting co-translational iMet processing does not impact ribosome decoding of ongoing peptide synthesis. Instead, our novel method to monitor iMet processing in vivo revealed that ribosomes purified from strains lacking MetAP ribosomal association (ES27L Δb1-4) or major yeast MetAP (Δmap1) increase iMet retention on ribosomal proteins (RPs). Given the densely packed structure of ribosomes, iMet retention on RPs may distort ribosomal structure and impair its function. Indeed, reconstituted IVT systems containing iMet-retaining ribosome subunits from ES27L Δb1-4 strain, combined with translation factors from wild-type strains, elucidated that iMet retention on the 40S ribosomal subunit causes translation errors. Our study demonstrated the critical role of ES27L in adjusting ribosome association of universally conserved MetAP enzyme to fine-tune iMet processing of key RPs, thereby ensuring the structural integrity and functional accuracy of eukaryotic ribosomes.
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