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Probing RNA Structure with Dimethyl Sulfate Mutational Profiling with Sequencing In Vitro and in Cells
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Functional analysis of tRNA modification enzymes using mutational profiling.

Ryota Yamagami1, Hiroyuki Hori1

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

Methods in Enzymology
|November 4, 2023
PubMed
Summary
This summary is machine-generated.

This study presents a high-throughput mutational profiling method to analyze tRNA methyltransferase enzymatic function. The protocol, demonstrated with TrmK, offers mechanistic insights into substrate recognition for various tRNA modifications.

Keywords:
High-throughput screeningMutational profilingRNA methyltransferaseRNA modificationRNA-protein interactionTransfer RNA

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Transfer RNA (tRNA) is crucial for protein synthesis, acting as an adapter molecule for messenger RNA (mRNA) codon decoding.
  • Post-transcriptional modifications are essential for tRNA structure, function, and interactions with enzymes and other molecules.
  • Site-specific tRNA modification enzymes catalyze the synthesis of most modified nucleosides, impacting diverse biological processes.

Purpose of the Study:

  • To provide a detailed protocol for high-throughput analysis of tRNA methyltransferase enzymatic function using mutational profiling.
  • To gain mechanistic insights into substrate recognition by tRNA methyltransferases, using TrmK as a model enzyme.

Main Methods:

  • Development and application of a mutational profiling protocol.
  • Utilizing tRNA m1A22 methyltransferase TrmK from Geobacillus stearothermophilus as a model system.
  • High-throughput analysis of enzyme-substrate interactions.

Main Results:

  • Demonstrated the utility of mutational profiling for studying tRNA methyltransferase mechanisms.
  • Provided mechanistic insights into how TrmK recognizes its substrate tRNAs.
  • Established a versatile protocol applicable to various tRNA modification enzymes.

Conclusions:

  • The developed mutational profiling protocol enables high-throughput analysis of tRNA methyltransferase activity.
  • This method provides valuable mechanistic insights into tRNA-modifying enzymes and their substrate recognition.
  • The protocol is adaptable for studying a range of enzymes involved in modifications at the Watson-Crick face of tRNA.