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Reprogramming the genetic code with flexizymes.

Takayuki Katoh1, Hiroaki Suga2

  • 1Department of Chemistry, Graduate School of Science, University of Tokyo, Tokyo, Japan. katoh@chem.s.u-tokyo.ac.jp.

Nature Reviews. Chemistry
|October 21, 2024
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Summary

Flexizymes are adaptable ribozymes that enable the creation of nonproteinogenic aminoacyl-transfer RNAs (tRNAs) for genetic code reprogramming. This technology allows for the synthesis of unique peptides and proteins by incorporating diverse amino acids into ribosomal translation.

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Area of Science:

  • Synthetic Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The canonical genetic code assigns 61 sense codons to 20 proteinogenic amino acids.
  • Ribosomal incorporation of nonproteinogenic amino acids (npAAs) is advanced by genetic code manipulation techniques.
  • Aminoacyl-transfer RNAs (tRNAs) are crucial for translating messenger RNA (mRNA) into peptides, recognizing codons via anticodons.

Purpose of the Study:

  • To review the development, structure, mechanism, and applications of flexizymes.
  • To highlight flexizymes' capability in preparing diverse aminoacyl-tRNAs for genetic code reprogramming.
  • To showcase the synthesis of unique peptides and proteins using flexizyme-mediated npAA incorporation.

Main Methods:

  • Flexizymes are adaptable aminoacylation ribozymes used to prepare diverse aminoacyl-tRNAs.
  • Flexizymes utilize amino acids activated with suitable leaving groups and require an aromatic ring for recognition.
  • The system accommodates L-α-amino acids with side chain modifications and backbone-modified npAAs.

Main Results:

  • Flexizymes enable the charging of virtually any amino acid onto any tRNA.
  • The flexizyme system overcomes the specificity limitations of natural aminoacyl-tRNA synthetases (ARSs).
  • This method facilitates the synthesis of peptides and proteins with npAAs through genetic code reprogramming.

Conclusions:

  • Flexizymes represent a versatile tool for expanding the amino acid repertoire in protein synthesis.
  • The technology allows for the creation of novel peptides and proteins with tailored properties.
  • Flexizymes are instrumental in advancing genetic code reprogramming for diverse applications in biotechnology and beyond.