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Related Experiment Videos

Synthesizing topological structures containing RNA.

Di Liu1, Yaming Shao2, Gang Chen1

  • 1Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, USA.

Nature Communications
|April 1, 2017
PubMed
Summary
This summary is machine-generated.

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Researchers created synthetic single-stranded RNA (ssRNA) topological structures, revealing topological inhibition of reverse transcription (RT) and low RNA topoisomerase activity in E. coli DNA topoisomerase I.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • RNA Topology

Background:

  • Knotting and entanglement are known in DNA and proteins, but their presence in RNA is not well understood.
  • Studying synthetic RNA topological structures is crucial for understanding RNA's physical and biological properties.
  • This knowledge could help identify naturally occurring topologically complex RNA molecules.

Purpose of the Study:

  • To synthesize and characterize single-stranded RNA (ssRNA) topological structures.
  • To investigate the activity of Escherichia coli DNA topoisomerase I on ssRNA.
  • To explore the impact of RNA topology on reverse transcription (RT).

Main Methods:

  • Construction of topological ssRNA structures using RNA-DNA hybrid four-way junctions or template-directed synthesis.

Related Experiment Videos

  • Utilizing a synthetic ssRNA knot as a topological probe to assess enzyme activity.
  • Analyzing reverse transcription and RT-PCR patterns of knotted and circular ssRNA.

    • Main Results:

    • Successfully created topological structures with single-stranded RNA (ssRNA) lacking strong base pairing.
    • Escherichia coli DNA topoisomerase I exhibited low activity on ssRNA, with a specific mutation (R173A) abolishing ssRNA unknotting but not ssDNA unknotting.
    • Discovered topological inhibition of reverse transcription (RT), with distinct RT-PCR patterns observed for ssRNA knots versus circles of identical sequences.

    Conclusions:

    • Synthetic ssRNA topological structures can be created, providing tools to study RNA topology.
    • Escherichia coli DNA topoisomerase I has limited activity on ssRNA, suggesting topological specificity.
    • RNA topology influences reverse transcription, opening new avenues for understanding RNA function and regulation.