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Related Experiment Video

Updated: May 3, 2026

In vitro Assembly of Semi-artificial Molecular Machine and its Use for Detection of DNA Damage
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RNA Scanning of a Molecular Machine with a Built-in Ruler.

Hye Ran Koh1, Mary Anne Kidwell, Jennifer Doudna

  • 1Department of Biophysics, Johns Hopkins University , Baltimore, Maryland 21218, United States.

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|December 14, 2016
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Summary
This summary is machine-generated.

Transactivation response RNA binding protein (TRBP) diffuses on dsRNA via coordinated subdomain movement. A flexible linker dictates diffusion distance, revealing a ruler-like mechanism for scanning RNA substrates.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • RNA Biology

Background:

  • Advanced single-molecule techniques allow real-time tracking of DNA and RNA motor proteins.
  • The ATP-independent diffusion mechanism of transactivation response RNA binding protein (TRBP) on double-stranded RNA (dsRNA) was previously reported but mechanistically unclear.

Purpose of the Study:

  • To elucidate the mechanistic details of TRBP diffusion on dsRNA.
  • To investigate the role of TRBP subdomains and linker region in its movement and substrate recognition.

Main Methods:

  • Utilized single-molecule fluorescence assays to track TRBP movement on dsRNA.
  • Manipulated the length of the flexible linker domain connecting TRBP's dsRNA-binding domains (dsRBD1 and dsRBD2).

Main Results:

  • TRBP diffusion is coordinated by independent movements of its two dsRNA-binding subdomains (dsRBD1 and dsRBD2).
  • The diffusion distance is directly proportional to the length of the flexible linker, suggesting a ruler-like function.
  • TRBP diffusion halts at physical barriers like RNA:DNA hybrids or secondary structures, indicating a scanning mechanism.

Conclusions:

  • TRBP employs a unique diffusion mechanism involving coordinated subdomain movement and a ruler-like linker for dsRNA scanning.
  • This mechanism is crucial for TRBP's role in identifying and binding pre-miRNA and pre-siRNA substrates for the RNAi pathway.