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Transfer RNA Synthesis02:36

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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.
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Related Experiment Video

Updated: Aug 20, 2025

Extremely Rapid and Specific Metabolic Labelling of RNA In Vivo with 4-Thiouracil Ers4tU
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A selective and sensitive detection system for 4-thiouridine modification in RNA.

Yuzuru Sugio1, Ryota Yamagami1, Naoki Shigi2

  • 1Department of Materials Science and Biotechnology, Graduate School of Science and Engineering, Ehime University, Matsuyama, Ehime 790-8577, Japan.

RNA (New York, N.Y.)
|November 21, 2022
PubMed
Summary

A new method using MTSEA biotin-XX efficiently detects 4-thiouridine (s4U) in RNA. This selective labeling technique is crucial for advancing RNA technologies and understanding tRNA modification.

Keywords:
4-thiouridineSaccharomyces cerevisiaeThermus thermophiluschemical probingtRNA

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Saccharomyces cerevisiae Metabolic Labeling with 4-thiouracil and the Quantification of Newly Synthesized mRNA As a Proxy for RNA Polymerase II Activity

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • RNA Biology

Background:

  • 4-Thiouridine (s4U) is a modified nucleoside in tRNA, vital for eubacteria and archaea.
  • Ongoing research explores s4U's biosynthesis, function, and biotechnological applications in RNA analysis.
  • A sensitive and selective detection method for s4U is crucial for progress in RNA modification and technologies.

Purpose of the Study:

  • To develop and validate a sensitive and quantitative method for detecting 4-thiouridine (s4U) in RNA.
  • To assess the selectivity of the developed method against other sulfur-containing modified nucleosides.
  • To demonstrate the utility of the method for analyzing s4U formation and visualizing newly transcribed tRNAs.

Main Methods:

  • Labeling of 4-thiouridine (s4U) using biotin-coupled 2-aminoethyl-methanethiosulfonate (MTSEA biotin-XX).
  • Testing the selectivity of MTSEA biotin-XX with Thermus thermophilus tRNAs containing 5-methyl-2-thiouridine.
  • Evaluating the method with and without a denaturation step to optimize detection limits.
  • Application of the system for analyzing s4U formation and visualizing newly transcribed tRNAs in S. cerevisiae.

Main Results:

  • The MTSEA biotin-XX labeling system is sensitive and quantitative for s4U detection.
  • The system demonstrates high selectivity, reacting specifically with s4U and not with other sulfur-containing modified nucleosides like s2U derivatives.
  • The detection limit can be improved by including a denaturation step.
  • The method allows for rapid analysis of multiple samples and visualization of newly transcribed tRNAs.

Conclusions:

  • MTSEA biotin-XX provides a selective and sensitive tool for detecting 4-thiouridine (s4U) in RNA.
  • This method significantly advances RNA analysis, tRNA modification studies, and the understanding of RNA biology.
  • The system's ability to visualize newly transcribed tRNAs opens new avenues for cellular RNA research.