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Related Experiment Video

Updated: Oct 29, 2025

Bacterial Inner-membrane Display for Screening a Library of Antibody Fragments
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Clinically Relevant Bacterial Outer Membrane Models for Antibiotic Screening Applications.

Zeinab Mohamed1, Jung-Ho Shin2, Surajit Ghosh3

  • 1Meinig School of Biomedical Engineering, Cornell University, Ithaca, New York United States.

ACS Infectious Diseases
|July 6, 2021
PubMed
Summary

Researchers developed a novel platform using outer membrane vesicles (OMVs) from Gram-negative bacteria to study antibiotic resistance. This cell-free model accurately mimics bacterial outer membranes, aiding in the discovery of new antibiotics and phage therapies.

Keywords:
Gram-negative bacteriamembrane interactionsmembrane modelouter membrane vesiclesupported bilayer

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Area of Science:

  • Microbiology
  • Biophysics
  • Drug Discovery

Background:

  • Antibiotic resistance is a major global health threat, particularly in Gram-negative bacteria.
  • The bacterial outer membrane presents a significant barrier to antibiotic penetration and can mediate resistance.
  • Existing model membranes lack the compositional complexity of native bacterial outer membranes.

Purpose of the Study:

  • To develop and validate a novel surface-supported membrane platform using outer membrane vesicles (OMVs).
  • To characterize the biophysical properties of OMVs and their interaction with antibacterial compounds.
  • To provide a cell-free, non-pathogenic model for studying membrane-mediated antibiotic resistance.

Main Methods:

  • Developed a surface-supported membrane platform utilizing OMVs from clinically relevant Gram-negative bacteria.
  • Characterized membrane biophysical properties, including fluidity, outer membrane proteins (OMPs), and lipopolysaccharide (LPS).
  • Investigated the interaction of OMV bilayers with antibiotic compounds (polymyxin B, bacitracin, vancomycin) using advanced microscopy and quartz crystal microbalance.

Main Results:

  • The OMV platform successfully retained key outer membrane features like fluidity, OMPs, and LPS.
  • OMV bilayers accurately recapitulated interactions (or lack thereof) with tested antibiotic compounds.
  • The platform demonstrated compatibility with advanced surface characterization tools.

Conclusions:

  • The OMV-based membrane platform serves as a robust and representative model for bacterial outer membranes.
  • This platform facilitates the study of antibiotic-induced membrane changes and resistance mechanisms.
  • Potential applications include screening membrane-active antibiotics and developing targeted phage therapies.