ArticleMolecular cell2026
Mechanical forces regulate the composition and fate of stalled nascent chains.
Article in Molecular cell, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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Who cites it
6 citing papers in PubMed.
- Ribosome-associated quality control and related mechanisms.Nature structural & molecular biology · 2026Review
- Article
- Mitochondrial Protein Carboxyl-Terminal Alanine-Threonine Tailing Promotes Human Glioblastoma Growth by Regulating Mitochondrial Function.bioRxiv : the preprint server for biology · 2026Article
- Defective Ribosome Recycling: A Bridge Between Translation Fidelity, Organelle Dysfunction, and Diseases: Exploring How Flawed Ribosome Recycling Factors Impact Ribosome Metabolism and Organelle Homeostasis, Leading to Human Diseases.BioEssays : news and reviews in molecular, cellular and developmental biology · 2025Review
- The ribosome ubiquitination code: fine-tuning translation under stress.Trends in biochemical sciences · 2025Review
- Mechanism of nascent chain removal by the ribosome-associated quality control complex.Nature communications · 2025Article
Corrections and comments
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Authors and funding
4 authors.
Funding
Abstract
The ribosome-associated quality control (RQC) pathway resolves stalled ribosomes. As part of RQC, stalled nascent polypeptide chains (NCs) are appended with CArboxy-Terminal amino acid tails (CAT tails) in an mRNA-free, non-canonical elongation process. The relationship between CAT tail composition (alanine [Ala] and threonine [Thr] in yeast) and function has remained unknown. Using biochemical approaches in yeast, we discovered that mechanical forces on the NC regulate CAT tailing. We propose that CAT tailing initially operates in "extrusion mode," which increases NC lysine accessibility for on-ribosome ubiquitylation. Thr in CAT tails prevents the formation of polyalanine, which forms α-helices that lower extrusion efficiency and disrupt termination of CAT tailing. After NC ubiquitylation, pulling forces on the NC switch CAT tailing to an Ala-only "release mode," which facilitates NC release and degradation. Failure to switch from extrusion to release mode leads to the accumulation of NCs on large ribosomal subunits and proteotoxic aggregation of Thr-rich CAT tails.
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Registered trials
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