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Updated: Jul 1, 2026

Single Molecule Fluorescence Microscopy on Planar Supported Bilayers
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Single Molecule Fluorescence Microscopy on Planar Supported Bilayers

Published on: October 31, 2015

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Freestanding bilayer microscope for single-molecule imaging of membrane proteins

Gonzalo Pérez-Mitta1, Yeliz Sezgin1, Weiwei Wang1

  • 1Laboratory of Molecular Neurobiology and Biophysics, Howard Hughes Medical Institute, The Rockefeller University, New York, NY, USA.

Science Advances
|June 21, 2024
PubMed

Insights

This study introduces the freestanding bilayer microscope (FBM) for studying integral membrane protein (IMP) dynamics. The FBM enables single-molecule resolution and unconstrained diffusion, advancing our understanding of cell membrane processes.

Area of Science:

  • Biophysics
  • Cell Biology
  • Membrane Protein Dynamics

Background:

  • Integral membrane proteins (IMPs) are crucial for cellular functions but their dynamics are poorly understood.
  • Current in vitro methods limit systematic studies of IMP behavior in complex membrane environments.

Purpose of the Study:

  • To introduce and validate a novel microscopy technique for studying IMP dynamics.
  • To overcome limitations of existing methods for in vitro analysis of membrane protein behavior.

Main Methods:

  • Development of the freestanding bilayer microscope (FBM) combining freestanding bilayers with single-particle tracking.
  • Benchmarking FBM against total internal reflection fluorescence (TIRF) imaging.
  • Application of FBM to measure ion channel open probability and diffusion in phase-separated bilayers.

Main Results:

  • The FBM provides single-molecule resolution and unconstrained diffusion analysis of IMPs.
  • FBM performance was validated against established TIRF microscopy techniques.
  • The FBM was successfully used to study ion channel dynamics and behavior in specific membrane environments.

Conclusions:

  • The freestanding bilayer microscope (FBM) is a powerful new tool for investigating membrane protein organization and dynamics.
  • FBM facilitates a deeper understanding of cell membrane processes and IMP functions.
  • This technique opens new avenues for studying the complex behavior of membrane proteins in vitro.

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