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Solid-state nanopore sensing reveals conformational changes induced by a mutation in a neuron-specific tRNAArg.

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Solid-state nanopore sensing reveals distinct RNA structures. This single-molecule technique analyzes RNA conformational ensembles, aiding in understanding neurodegenerative diseases linked to RNA mutations.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Neuroscience

Background:

  • RNA molecules exist in various conformational ensembles that dictate their function.
  • Mutations in RNA can lead to altered structures and cellular dysfunction, contributing to diseases like neurodegeneration.
  • Studying RNA conformational dynamics is crucial for understanding cellular physiology and pathology.

Purpose of the Study:

  • To investigate the conformational landscape of a neuron-specific tRNA (n-Tr20) and its C50U mutant using solid-state nanopore sensing.
  • To identify metastable RNA conformers not readily observable by traditional ensemble methods.
  • To elucidate how the C50U mutation in n-Tr20 affects its structural ensemble and potentially contributes to neurodegeneration.

Main Methods:

  • Solid-state nanopore sensing for real-time, single-molecule analysis of RNA.
  • Utilizing an 8 nm nanopore to record ion-current traces of RNA molecules.
  • Complementary structural analysis using cryo-electron microscopy (cryo-EM) and small-angle X-ray scattering (SAXS).

Main Results:

  • Solid-state nanopore sensing effectively identified distinct conformational ensembles for wild-type n-Tr20 and its C50U mutant, with and without Mg2+.
  • The C50U mutation was shown to stabilize a different conformational ensemble compared to the wild type, impacting precursor maturation.
  • Cryo-EM and SAXS data corroborated the structural plasticity observed through nanopore sensing.

Conclusions:

  • Solid-state nanopore sensing is a powerful single-molecule tool for analyzing RNA conformational ensembles.
  • This technique provides insights into RNA structural dynamics relevant to cellular function and disease.
  • Nanopore sensing offers a valuable addition to the toolkit for RNA structural analysis, particularly for studying dynamics.