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Riboswitches01:56

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Amplifying Riboswitch Signal Output Using Cellular Wiring.

Michael S Goodson1,2, Annastacia C Bennett1,2, Brenton R Jennewine1

  • 1711th Human Performance Wing, Air Force Research Laboratory , Wright-Patterson Air Force Base, Ohio 45433, United States.

ACS Synthetic Biology
|April 22, 2017
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This study introduces a novel amplification system for riboswitch-based biological sensors. The system enhances signal output and sensitivity in E. coli, advancing sensor development.

Keywords:
amplificationbiological circuitbiosensorsriboswitchsignalingsynthetic biology

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Area of Science:

  • Synthetic Biology
  • Molecular Biology
  • Biotechnology

Background:

  • Riboswitches are genetic circuits that can regulate gene expression in response to specific molecules.
  • Existing riboswitch-based sensors often suffer from low signal output, limiting their sensitivity and applicability.
  • Enhancing signal amplification is crucial for realizing the full potential of fieldable biological sensors.

Purpose of the Study:

  • To develop and characterize a novel modular amplification system for riboswitch-based biological sensors.
  • To improve signal output, sensitivity, and detection speed in E. coli.
  • To enable riboswitch-based reporting in strains with previously undetectable outputs.

Main Methods:

  • A modular amplification circuit was designed using a riboswitch to initiate signaling between sensing and reporter strains of E. coli.
  • Quorum sensing signaling molecules were employed to create a biological link between the engineered strains.
  • Fluorescence output was measured to quantify signal generation upon ligand binding.

Main Results:

  • The amplification circuit significantly increased fluorescence output compared to direct riboswitch control.
  • Enhanced sensitivity allowed for detectable riboswitch-based reporting in E. coli strains that previously showed no output.
  • The system demonstrated a reduced time to signal detection.

Conclusions:

  • The developed modular amplification system effectively boosts signal output and sensitivity of riboswitch-based sensors.
  • This approach advances the development of more robust and versatile biological sensors.
  • The modularity and performance improvements offer a promising platform for future biosensor applications.