Cited by 278RNA and protein synthesis mechanismsBacterial Genetics and BiotechnologyProtein Structure and Dynamics

Silent Substitutions Predictably Alter Translation Elongation Rates and Protein Folding Efficiencies

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Spencer, Paige S., Siller, Efraín, Anderson, John F., Barral, José M.·2012·Journal of Molecular Biology

Abstract

Genetic code redundancy allows most amino acids to be encoded by multiple codons that are non-randomly distributed along coding sequences. An accepted theory explaining the biological significance of such non-uniform codon selection is that codons are translated at different speeds. Thus, varying codon placement along a message may confer variable rates of polypeptide emergence from the ribosome, which may influence the capacity to fold toward the native state. Previous studies report conflicting results regarding whether certain codons correlate with particular structural or folding properties of the encoded protein. This is partly due to different criteria traditionally utilized for predicting translation speeds of codons, including their usage frequencies and the concentration of tRNA species capable of decoding them, which do not always correlate. Here, we developed a metric to predict organism-specific relative translation rates of codons based on the availability of tRNA decoding mechanisms: Watson-Crick, non-Watson-Crick or both types of interactions. We determine translation rates of messages by pulse-chase analyses in living Escherichia coli cells and show that sequence engineering based on these concepts predictably modulates translation rates in a manner that is superior to codon usage frequency, which occur during the elongation phase, and significantly impacts folding of the encoded polypeptide. Finally, we demonstrate that sequence harmonization based on expression host tRNA pools, designed to mimic ribosome movement of the original organism, can significantly increase the folding of the encoded polypeptide. These results illuminate how genetic code degeneracy may function to specify properties beyond amino acid encoding, including folding.

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Crossref · 10.1016/j.jmb.2012.06.010

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  • Replacement of rare codons must be used judiciously because, for some proteins, the slower translation rate of rare codons is necessary for proper protein folding.

    “Although replacement of rare codons is an attractive optimization strategy, it must be used judiciously. This is because, in the case of some proteins, the slower translation rate of rare codons is necessary for proper protein folding22.”

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Authors
Spencer, P. S., Siller, E., Anderson, J. F., & Barral, J. M.
Affiliations
The University of Texas Medical Branch at Galveston (US)
Corresponding author
Barral, José M.
Venue
Journal of Molecular Biology
Publisher
Elsevier BV
Published
2012-09
Volume
422
Issue
3
Pages
328-335
ISSN
0022-2836 (ISSN-L)
OpenAlex
W2094148055
Cited by
278
References
30
Citations by year
2026: 10 · 2025: 9 · 2024: 34 · 2023: 21 · 2022: 14 · 2021: 19 · 2020: 14 · 2019: 17 · 2018: 45 · 2017: 27 · 2016: 20 · 2015: 20 · 2014: 14 · 2013: 10 · 2012: 3
FWCI
6.04
Type
journal article
Language
en
Open access
Locations
  • Journal of Molecular Biology (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Francis Crick Institute
  • National Institutes of Health (UL1TR000071)
  • National Institute on Aging (P30AG024832)
  • National Center for Research Resources (UL1RR029876)
  • National Center for Advancing Translational Sciences
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
Keywords
codon usage, translation elongation rate, protein folding, genetic code redundancy, tRNA decoding, Escherichia coli, pulse-chase analysis
MeSH terms
Base Sequence, Codon, Escherichia coli, Genetic Code, Molecular Sequence Data, Peptide Chain Elongation, Translational, Proteins, Ribosomes, RNA, Transfer, Protein Biosynthesis, Protein Folding, Amino Acid Substitution

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