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A high-throughput screen for identifying transmembrane pore-forming peptides.

J M Rausch1, W C Wimley

  • 1Department of Biochemistry SL43, Tulane University Health Sciences Center, New Orleans, Louisiana 70112-2699, USA.

Analytical Biochemistry
|June 12, 2001
PubMed
Summary

This study introduces a visual assay for quickly screening molecules that disrupt cell membranes. The assay uses terbium(III) and dipicolinic acid fluorescence to detect membrane damage, enabling high-throughput screening of potential therapeutics.

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Area of Science:

  • Biochemistry
  • Biophysics
  • Analytical Chemistry

Background:

  • Membrane-disrupting molecules are crucial in medicine and biology.
  • High-throughput screening methods are needed to identify novel membrane-active compounds.
  • Existing assays may lack sensitivity or visual detectability for rapid screening.

Purpose of the Study:

  • To develop a rapid, visual, and high-throughput assay for screening membrane-disrupting molecules.
  • To utilize the fluorescence of terbium(III) and dipicolinic acid for detecting membrane permeabilization.
  • To establish a sensitive method for identifying pore-forming peptides and other membrane-active agents.

Main Methods:

  • Development of a microwell plate assay using unilamellar phospholipid vesicles.

Related Experiment Videos

  • Incorporation of terbium(III) and dipicolinic acid into vesicles and external solutions.
  • Detection of Tb(3+)/DPA complex fluorescence upon membrane disruption by analytes.
  • Visual assessment of fluorescence for compound screening.

    • Main Results:

    • The assay demonstrates visual detectability of the Tb(3+)/DPA complex at concentrations as low as 2.5 microM.
    • Detection limits for phospholipid vesicles were approximately 50 microM.
    • The system successfully detected as little as 0.25 microM or 5 pmol of the pore-forming peptide alamethicin.
    • The assay is sensitive, high-throughput, and automatable.

    Conclusions:

    • A novel visual assay for screening membrane-disrupting molecules has been successfully developed.
    • The assay leverages Tb(3+)/DPA fluorescence for sensitive and rapid detection of membrane permeabilization.
    • This method facilitates the visual screening of large libraries for novel pore-forming peptides and other membrane-active compounds.