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Area of Science:

  • Biochemistry
  • Synthetic Biology
  • RNA Therapeutics

Background:

  • RNA's functional polymer capabilities are limited by low side chain diversity compared to proteins.
  • Existing RNA modifications do not typically confer environmental responsiveness.

Purpose of the Study:

  • To investigate the incorporation of 2-thiouridine (2sU) into functional RNAs.
  • To determine if 2sU-modified RNAs can be activated by oxidative treatment.
  • To explore RNA's potential as a redox-sensitive functional polymer.

Main Methods:

  • Incorporation of 2-thiouridine (2sU) into aptamer and ribozyme RNAs.
  • Assessment of RNA folding and function after 2sU incorporation.
  • Oxidative desulfurization of 2sU to uridine to restore RNA function.

Main Results:

  • 2sU incorporation functionally inactivated aptamers and ribozymes by disrupting proper RNA folding.
  • Oxidative desulfurization of 2sU to uridine restored the folding and function of these RNAs.
  • This demonstrates that RNA can be engineered as a redox-responsive functional polymer.

Conclusions:

  • RNA can be engineered to be environmentally responsive through chemical modification.
  • Redox-switchable RNA has potential applications in regulating cellular processes and in synthetic biology.
  • This work challenges the view of RNA as non-redox-sensitive.