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Related Experiment Video

Updated: May 20, 2026

Expression and Purification of the Human Lipid-sensitive Cation Channel TRPC3 for Structural Determination by Single-particle Cryo-electron Microscopy

Expression and Purification of the Human Lipid-sensitive Cation Channel TRPC3 for Structural Determination by Single-particle Cryo-electron Microscopy

Published on: January 7, 2019

tRNA concentration fine tunes protein solubility.

Ivan Fedyunin¹, Lothar Lehnhardt, Nadine Böhmer

¹Institute of Biochemistry and Biology, University of Potsdam, Potsdam, Germany.

|July 24, 2012

Summary

Increasing the speed of protein synthesis by boosting low-abundance transfer RNAs (tRNAs) in E. coli accelerated protein aggregation. This ribosomal speed change also reduced the solubility of essential chaperone proteins, impacting cell-wide protein folding.

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Area of Science:

Molecular Biology
Protein Biochemistry
Genetics

Background:

Translation speed, influenced by codon usage and tRNA availability, is linked to co-translational protein folding.
The global impact of ribosomal elongation rate on cellular protein solubility and aggregation remains largely unexplored.

Purpose of the Study:

To investigate how altering ribosomal speed via low-abundance tRNAs affects protein aggregation and solubility in Escherichia coli.
To determine the consequences of modified tRNA concentrations on chaperone protein solubility and the folding of their client proteins.

Main Methods:

Upregulation of specific low-abundance transfer RNAs (tRNAs) in Escherichia coli.
Assessing protein aggregation propensity using biophysical methods.
Quantifying the solubility of various cellular proteins, including chaperones.
Evaluating the solubility of chaperone-dependent proteins under altered tRNA conditions.

Main Results:

Accelerated ribosomal elongation rates, achieved by upregulating three low-abundance tRNAs, significantly increased the aggregation propensity of several cellular proteins.
Modifications to the natural tRNA pool concentration impaired the solubility of multiple chaperone proteins.
The reduced solubility of chaperones consequently affected the solubility of certain chaperone-dependent proteins.

Conclusions:

Ribosomal speed, modulated by tRNA abundance, plays a critical role in maintaining cellular protein solubility and preventing aggregation.
Altering tRNA concentrations can disrupt the delicate balance of protein folding, impacting essential cellular machinery like chaperones and their clients.
These findings highlight tRNA dynamics as a key factor in cellular proteostasis and protein aggregation diseases.