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tRNA Modification Detection Using Graphene Nanopores: A Simulation Study.

Khadijah Onanuga1,2, Thomas J Begley1,2,3, Alan A Chen3,4

  • 1SUNY Polytechnic Institute, Colleges of Nanoscale Science and Engineering, 257 Fuller Road, Albany, NY, 12203, USA.

Biomolecules
|September 23, 2020
PubMed
Summary
This summary is machine-generated.

Detecting transfer RNA (tRNA) modifications using nanopore technology is feasible. Molecular dynamics simulations show graphene nanopores can distinguish modified uridine nucleosides, paving the way for new biomarker discovery.

Keywords:
graphenenanoporetRNA modificationwobble uridine

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Area of Science:

  • Biochemistry
  • Nanotechnology
  • Molecular Biology

Background:

  • Transfer RNA (tRNA) molecules undergo over 100 enzyme-catalyzed modifications.
  • Wobble uridine modifications are sensitive to environmental and disease states, indicating potential as biomarkers.
  • Current RNA modification detection methods analyze bulk samples, lacking single-molecule resolution.

Purpose of the Study:

  • To evaluate the feasibility of using nanopore detection technology for identifying modified tRNA nucleosides.
  • To assess the potential of single-molecule nanopore analysis for tRNA modification detection.
  • To explore nanopore-based detection as a novel approach for biomarker discovery.

Main Methods:

  • All-atom molecular dynamics (MD) simulations were conducted.
  • A five-layered graphene nanopore was simulated with localized canonical and modified uridine nucleosides.
  • Simulations were performed in a 1 M KCl solution with applied voltage biases.

Main Results:

  • Graphene nanopores successfully distinguished uridine from several modified forms (cm5U, mcm5U, mcm5s2U, mcm5Um) based on changes in nanopore resistance.
  • Nanopores with <3 nm diameter clearly differentiated mcm5Um and mcm5U from canonical uridine.
  • Other modifications showed modest but detectable decreases in nanopore conductance.

Conclusions:

  • Nanopore detection technology shows promise for single-molecule analysis of tRNA modifications.
  • Graphene nanopore dimensions can be optimized for distinguishing specific uridine modifications.
  • This approach could lead to novel diagnostic tools for environmental exposures and diseases.