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Related Experiment Videos

A bacterial biosensor of endocrine modulators.

Georgios Skretas1, David W Wood

  • 1Department of Chemical Engineering, Princeton University, Engineering Quadrangle, Olden St., Princeton, NJ 08544, USA.

Journal of Molecular Biology
|May 10, 2005
PubMed
Summary

A novel biosensor was created using bacterial cells to detect nuclear hormone receptor activity. This tool accelerates the discovery of new drugs by rapidly identifying potential therapeutic compounds.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Drug Discovery

Background:

  • Nuclear hormone receptors are crucial drug targets implicated in diseases like cancer.
  • Accelerating drug discovery requires efficient methods for identifying novel modulators.
  • In vivo ligand-binding sensors offer a rapid and cost-effective approach to lead identification.

Purpose of the Study:

  • To develop a novel bacterial biosensor for detecting nuclear hormone receptor ligand binding.
  • To demonstrate the utility of this biosensor in screening hormone analogues and identifying potential drug leads.

Main Methods:

  • Constructed a fusion protein of ligand-binding domains (estrogen receptor, thyroid hormone receptor) with thymidylate synthase (TS) in Escherichia coli.
  • Utilized TS-deficient bacterial growth phenotypes to report on ligand binding.
  • Screened libraries of estrogen and thyroid hormone analogues to assess biosensor performance.

Main Results:

  • The biosensor exhibited estrogen-dependent growth when using the estrogen receptor fusion.
  • The biosensor showed specific thyroid hormone-enhanced growth with the thyroid hormone receptor fusion.
  • Cell growth correlated with ligand-binding affinity, and the system distinguished between agonistic and antagonistic activities.

Conclusions:

  • A facile and effective bacterial biosensor for nuclear hormone receptor ligand binding has been developed.
  • This system accelerates the identification and selection of lead compounds for therapeutic development.
  • The biosensor can differentiate between agonists and antagonists, aiding in drug lead characterization.

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