The ribosome modulates folding inside the ribosomal exit tunnel

Florian Wruck, Pengfei Tian, Renuka Kudva, Robert B. Best, Gunnar von Heijne, Sander J. Tans*, Alexandros Katranidis

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
7 Downloads (Pure)

Abstract

Proteins commonly fold co-translationally at the ribosome, while the nascent chain emerges from the ribosomal exit tunnel. Protein domains that are sufficiently small can even fold while still located inside the tunnel. However, the effect of the tunnel on the folding dynamics of these domains is not well understood. Here, we combine optical tweezers with single-molecule FRET and molecular dynamics simulations to investigate folding of the small zinc-finger domain ADR1a inside and at the vestibule of the ribosomal tunnel. The tunnel is found to accelerate folding and stabilize the folded state, reminiscent of the effects of chaperonins. However, a simple mechanism involving stabilization by confinement does not explain the results. Instead, it appears that electrostatic interactions between the protein and ribosome contribute to the observed folding acceleration and stabilization of ADR1a.

Original languageEnglish
Article number523
Number of pages8
JournalCommunications Biology
Volume4
Issue number1
DOIs
Publication statusPublished - 2021

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