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Inhibition of sterol transport protein function.

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We developed biophysical and biochemical assays to screen for small molecule inhibitors of intracellular sterol transport proteins (STPs). These assays enable rapid identification and validation of compounds targeting STPs for various diseases.

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CholesterolDifferential scanning fluorimetryFRETFluorescence polarizationInhibitorsSterol transport protein

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Pharmacology

Background:

  • Intracellular sterol transport proteins (STPs) are crucial for cholesterol homeostasis.
  • Dysregulation of STPs is implicated in atherosclerosis, infectious diseases, and cancer.
  • Targeting STPs with small molecules offers therapeutic potential.

Purpose of the Study:

  • To outline biophysical and biochemical assays for screening small molecule inhibitors of STPs.
  • To enable medium-to-high throughput identification and validation of STP inhibitors.
  • To facilitate compound profiling for selectivity across related targets.

Main Methods:

  • Differential scanning fluorimetry for compound binding assessment.
  • Competitive fluorescence polarization assays using fluorescent sterols.
  • Förster Resonance Energy Transfer (FRET)-based lipid transport assays in liposomes.

Main Results:

  • Established a series of assays with increasing complexity for STP inhibition screening.
  • Demonstrated the utility of these assays for medium-to-high throughput screening.
  • Enabled direct profiling of compound selectivity across human STPs.

Conclusions:

  • Developed robust assays for identifying and validating small molecule STP inhibitors.
  • These assays are valuable tools for drug discovery targeting cholesterol homeostasis.
  • The established methods facilitate the development of novel therapeutics for STP-related diseases.