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Related Concept Videos

Transfer RNA Synthesis02:36

Transfer RNA Synthesis

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One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...
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tRNA Activation02:26

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Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
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Updated: Apr 25, 2026

Genome-wide Analysis of Aminoacylation Charging Levels of tRNA Using Microarrays
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Enhanced tRNA array method version 2 for simultaneous in vitro synthesis of 21 tRNAs.

Ryota Miyachi1, Anna Irie1, Norikazu Ichihashi2

  • 1Department of Life Science, Graduate School of Arts and Science, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan.

Journal of Bioscience and Bioengineering
|April 23, 2026
PubMed
Summary

Synthetically produced transfer RNAs (tRNAs) are crucial for synthetic biology. This study enhances in vitro tRNA synthesis, improving translation efficiency for self-reproducible gene expression systems.

Keywords:
Cell-free synthetic biologyIn vitro transcriptionPURE systemtRNA

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Area of Science:

  • Synthetic Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Transfer RNAs (tRNAs) are essential for protein translation.
  • Simultaneous in vitro synthesis of multiple tRNAs is a key challenge in bottom-up synthetic biology.
  • Previous tRNA array methods showed reduced translational activity compared to individually synthesized tRNAs.

Purpose of the Study:

  • To identify translation-limiting tRNA groups in the tRNA array method.
  • To improve the translational activity of simultaneously synthesized tRNAs.
  • To develop an enhanced tRNA array method for efficient in vitro synthesis.

Main Methods:

  • Identification of translation-limiting tRNA groups (PIEN group).
  • Sequence modification of tRNAs.
  • Incorporation of a leader sequence into the tRNA array construct.
  • Testing translational activity using multiple reporter proteins under various conditions.

Main Results:

  • Identified specific tRNA groups limiting translation in the array method.
  • Sequence modifications and leader sequence incorporation significantly improved translational activity.
  • The improved tRNA array method (version 2) achieved translation levels comparable to individually prepared tRNAs.
  • Effective under both translation-coupled and uncoupled conditions.

Conclusions:

  • The revised tRNA array method overcomes previous limitations in simultaneous in vitro tRNA synthesis.
  • This advancement provides a more efficient platform for creating self-reproducible gene expression systems.
  • Enables robust protein synthesis essential for synthetic biology applications.