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Related Experiment Video

Updated: Nov 19, 2025

Analysis of RNA Processing Reactions Using Cell Free Systems: 3' End Cleavage of Pre-mRNA Substrates in vitro
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Solid-phase XRN1 reactions for RNA cleavage: application in single-molecule sequencing.

Uditha S Athapattu1, Charuni A Amarasekara1, Jacob R Immel2

  • 1Department of Chemistry, University of Kansas, Lawrence, KS 66045, USA.

Nucleic Acids Research
|January 29, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel RNA sequencing method by immobilizing the XRN1 enzyme on a solid support. This enzymatic reactor enables efficient digestion of RNA, including modified bases, for single-molecule analysis.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Genomics

Background:

  • RNA modifications are numerous and challenging to detect with current sequencing technologies like next-generation sequencing (NGS).
  • Developing new methods for RNA sequencing is crucial for understanding RNA biology and function.

Purpose of the Study:

  • To establish a novel RNA exosequencing technique using an immobilized exoribonuclease enzyme.
  • To create an enzymatic reactor with covalently attached XRN1 on a solid support.

Main Methods:

  • Covalently attaching the XRN1 enzyme to a plastic solid support using EDC/NHS coupling chemistry.
  • Assessing solid-phase digestion efficiency of model RNAs compared to solution-phase digestion.
  • Demonstrating the immobilized XRN1's ability to digest methylated RNA (m6A, m5C).
  • Measuring the processivity and clipping rate of immobilized XRN1 using single-molecule fluorescence.

Main Results:

  • Solid-phase digestion efficiency of model RNAs was 87.6 ± 2.8%, exceeding solution-phase digestion (78.3 ± 4.4%).
  • Immobilized XRN1 successfully digested methylated RNA containing m6A and m5C.
  • Single-molecule measurements revealed a clipping rate of 26 ± 5 nt/s and processivity of >10.5 kb at 25°C.

Conclusions:

  • An enzymatic reactor with immobilized XRN1 was successfully developed for RNA exosequencing.
  • This method offers enhanced efficiency and the capability to sequence modified RNA molecules.
  • The immobilized XRN1 enzyme maintains high activity, processivity, and clipping rates for novel RNA sequencing applications.