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Related Concept Videos

Improving Translational Accuracy02:07

Improving Translational Accuracy

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Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
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Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
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Updated: Jul 6, 2025

An In Vitro Single-Molecule Imaging Assay for the Analysis of Cap-Dependent Translation Kinetics
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Continuous Fluorescence Assay for In Vitro Translation Compatible with Noncanonical Amino Acids.

Gianna N Kerestesy1,2, Kara K Dods1,2, Clinton A L McFeely1,2

  • 1Chemistry, Virginia Commonwealth University, 1001 W Main Street, Richmond, 23220 Virginia, United States.

ACS Synthetic Biology
|January 9, 2024
PubMed
Summary

Scientists developed a new continuous fluorescence assay to rapidly assess noncanonical amino acid (ncAA) incorporation in vitro. This method accelerates the optimization of translation components for drug discovery and synthetic biology applications.

Keywords:
affinity clampcontinuous assayfluorescent proteinsin vitro translationnoncanonical amino acidstRNA

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Area of Science:

  • Biochemistry and Molecular Biology
  • Synthetic Biology
  • Drug Discovery

Background:

  • The translation apparatus's ability to incorporate noncanonical amino acids (ncAAs) is crucial for generating diverse peptide libraries for drug discovery.
  • Current methods for assessing ncAA incorporation, such as radioactive assays and mass spectrometry, are time-consuming and limit high-throughput analysis.
  • Existing continuous in vitro translation assays using fluorescent proteins are unsuitable for ncAA testing due to their reliance on canonical amino acids.

Purpose of the Study:

  • To develop a novel, continuous fluorescence assay for in vitro translation that is compatible with noncanonical amino acid incorporation.
  • To enable high-throughput assessment and optimization of translation components for ncAA incorporation.
  • To facilitate the engineering of the translation apparatus for applications in drug discovery and synthetic biology.

Main Methods:

  • Development of a continuous fluorescence assay based on detecting a short peptide tag using an affinity clamp protein.
  • The affinity clamp protein exhibits altered fluorescent properties upon binding to the tagged peptide, signaling translation.
  • Implementation of the assay in a 384-well format for rapid, high-throughput screening.

Main Results:

  • The assay successfully validated the incorporation of various noncanonical amino acids (ncAAs) during in vitro translation.
  • The assay enabled rapid determination of codon reading specificities for multiple Escherichia coli tRNAs.
  • Demonstrated the assay's utility in a 384-well format for efficient screening and optimization.

Conclusions:

  • The developed continuous fluorescence assay provides a rapid and efficient method for assessing ncAA incorporation in vitro.
  • This assay significantly advances the ability to optimize translation components and screen ncAAs.
  • The assay is expected to accelerate the engineering of translation systems for drug discovery and synthetic biology.