[TALK 4] NGBS2025: Protein folding on the ribosome - John Christodolou

[TALK 4] NGBS2025: Protein folding on the ribosome - John Christodolou

by John Christodolou

Life & Natural Systems Biology PSBiology, life sciencesPSBBiochemistry
🎙 John Christodolou 👥 10K 📅 November 5, 2025 ⏱ 36 min 👁 236 📄 original study 🧭 2026-08-16
Available in: English (current) Français

Keywords

co-translational foldingnascent chainNMRcryo-EMthermodynamics

Summary

John Christodolou presents his research on co-translational protein folding, focusing on how the ribosome modulates the folding of nascent polypeptides. Using a combination of NMR spectroscopy, cryo-EM, and molecular dynamics, his team studied the folding of an Ig-like domain (FLN5) on the ribosome. They found that the folding pathway on the ribosome differs from in vitro refolding, with the appearance of stable intermediates. Initial experiments ruled out major roles for ribosome surface interactions and exit tunnel conformation. Instead, they discovered that the unfolded state is significantly expanded on the ribosome, leading to an entropic destabilization that stabilizes the intermediates. This work provides mechanistic insights into how the ribosome influences protein folding and misfolding, with implications for understanding diseases related to protein misfolding.

122 words

Critical Evaluation

Value of the Information & Strength of the Argument

The talk presents a comprehensive and well-structured argument, supported by a wealth of experimental data. The speaker systematically addresses alternative hypotheses and provides quantitative thermodynamic analysis. The use of multiple complementary techniques (NMR, cryo-EM, MD) strengthens the conclusions. The argumentation is logical and persuasive, with clear explanations of the methodology and results.

Scientific Rigor, Source Quality, Title Accuracy

The speaker is a recognized expert, and the work is likely published in high-impact journals. The talk references specific techniques and prior studies, though specific citations are not explicitly given. The title accurately reflects the content. The presentation is scientifically rigorous, with careful controls and validation. The description provides links to the speaker’s lab page and the symposium, which are relevant sources.

129 words

Title / Content Match

The title accurately reflects the content, which focuses on protein folding on the ribosome.

Quality & Reliability

9/10

Presentation of original research by a leading expert, with detailed methodology and data. The work is published or submitted to peer-reviewed journals, and the speaker is affiliated with a reputable institution.

Key Moments

Markers derived by PSI from the transcript: the creator did not define chapters.

Cited Sources

Concurring Sources

External References

Contribution & Novelties

The talk presents novel findings on how the ribosome modulates protein folding by destabilizing the unfolded state, leading to the formation of stable intermediates. This challenges previous assumptions and provides a thermodynamic basis for co-translational folding differences.

Pour aller plus loin :

64 words

Radar Profile

The radar profile shows high scores across all dimensions, indicating a well-balanced and rigorous presentation. The talk excels in information quality and technical depth, with strong reliability.

Reliability 9/10