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Hyperaccurate Ribosomes for Improved Genetic Code Reprogramming.

Bipasana Shakya1,2, Olivia G Joyner1,2, Matthew C T Hartman1,2

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Hyperaccurate ribosomes enhance the efficiency and fidelity of genetic code reprogramming with noncanonical amino acids (ncAAs). This advance in synthetic biology improves peptide synthesis for drug discovery.

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Area of Science:

  • Synthetic Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Genetic code reprogramming using noncanonical amino acids (ncAAs) is crucial for synthetic biology and peptide drug discovery.
  • Efficient and high-fidelity ribosomes are essential for incorporating ncAAs, but challenges like near-cognate readthrough and peptidyl-tRNA dropoff exist.
  • The PURE translation system is a cell-free system used to study ribosomal function.

Purpose of the Study:

  • To investigate the extent of competing pathways (near-cognate readthrough and peptidyl-tRNA dropoff) in the PURE translation system with challenging ncAAs.
  • To evaluate the impact of hyperaccurate or error-restrictive ribosomes on yield and fidelity.
  • To assess the effect of hyperaccurate ribosomes on quadruplet codon readthrough.

Main Methods:

  • Utilized the PURE translation system with mRNAs encoding peptides featuring N- and C-terminal affinity tags.
  • Introduced mutations in ribosomal protein S12 to create hyperaccurate or error-restrictive ribosomes.
  • Analyzed ribosomal performance with both canonical amino acids and a challenging α,α-disubstituted ncAA.

Main Results:

  • Identified the significant impact of near-cognate readthrough and peptidyl-tRNA dropoff in the PURE system.
  • Demonstrated that hyperaccurate ribosomes significantly improve yield and fidelity for both canonical and noncanonical amino acid incorporation.
  • Showed that hyperaccurate ribosomes enhance yields for quadruplet codon readthrough with an expanded anticodon stem-loop tRNA, but do not eliminate triplet codon reading.

Conclusions:

  • Hyperaccurate ribosomes represent a significant advancement for synthetic biology by improving fidelity and yield in ncAA incorporation.
  • The simplicity of introducing S12 mutations makes hyperaccurate ribosomes a practical tool for engineering the translation apparatus.
  • These findings pave the way for more sophisticated peptide synthesis and drug discovery applications.