Evolved sequence contexts for highly efficient amber suppression with noncanonical amino acids

ACS Chemical Biology
Moritz PottDaniel Summerer

Abstract

The expansion of the genetic code with noncanonical amino acids (ncAA) enables the function of proteins to be tailored with high molecular precision. In this approach, the ncAA is charged to an orthogonal nonsense suppressor tRNA by an aminoacyl-tRNA-synthetase (aaRS) and incorporated into the target protein in vivo by suppression of nonsense codons in the mRNA during ribosomal translation. Compared to sense codon translation, this process occurs with reduced efficiency. However, it is still poorly understood, how the local sequence context of the nonsense codon affects suppression efficiency. Here, we report sequence contexts for highly efficient suppression of the widely used amber codon in E. coli for the orthogonal Methanocaldococcus jannaschii tRNA(Tyr)/TyrRS and Methanosarcina mazei tRNA(Pyl)/PylRS pairs. In vivo selections of sequence context libraries consisting of each two random codons directly up- and downstream of an amber codon afforded contexts with strong preferences for particular mRNA nucleotides and/or amino acids that markedly differed from preferences of contexts obtained in control selections with sense codons. The contexts provided high amber suppression efficiencies with little ncAA-dependence that were t...Continue Reading

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Citations

Oct 1, 2015·ACS Chemical Biology·Moritz J SchmidtDaniel Summerer
Sep 25, 2015·Nature Protocols·Daniel RösnerAndreas Marx
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Jan 23, 2021·ACS Chemical Biology·Mariha IslamJames A Van Deventer
Mar 24, 2021·Journal of the American Chemical Society·Miglena ManandharFloyd E Romesberg
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Feb 14, 2020·ACS Synthetic Biology·Christopher M ScheidlerSabine Schneider
Oct 22, 2021·Journal of Molecular Biology·Sooin KimHyun Soo Lee

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