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Related Experiment Videos

Imaging the membrane protein bacteriorhodopsin with the atomic force microscope.

H J Butt1, K H Downing, P K Hansma

  • 1Department of Physics, University of California, Santa Barbara 93106.

Biophysical Journal
|December 1, 1990
PubMed
Summary

Atomic force microscopy visualized bacteriorhodopsin membrane proteins on various substrates. This technique revealed molecular structure and enabled imaging of protein-ligand interactions under native conditions.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Nanotechnology

Background:

  • Bacteriorhodopsin is a crucial membrane protein.
  • Understanding its structure and interactions is vital for biological and technological applications.
  • Previous imaging techniques had limitations in resolving native structures.

Purpose of the Study:

  • To image bacteriorhodopsin using atomic force microscopy (AFM).
  • To investigate the feasibility of using different substrates for imaging.
  • To explore the potential for studying protein-ligand interactions in situ.

Main Methods:

  • Atomic Force Microscopy (AFM) at room temperature.
  • Utilized mica, silanized glass, and lipid bilayers as substrates.
  • Two-dimensional Fourier transform for lattice analysis.

Related Experiment Videos

  • Imaging of bacteriorhodopsin and cationic ferritin.

    • Main Results:

    • Successfully imaged single bacteriorhodopsin molecules in purple membranes on mica.
    • Determined a hexagonal lattice constant of 6.21 ± 0.20 nm, consistent with electron diffraction.
    • Resolved structural features down to approximately 1.1 nm.
    • Visualized cationic ferritin bound to bacteriorhodopsin, demonstrating potential for binding studies.
    • Imaged purple membranes reconstituted into lipid bilayers.

    Conclusions:

    • AFM is effective for imaging bacteriorhodopsin structure at high resolution.
    • Silanized glass and lipid bilayers are suitable substrates for studying membrane proteins.
    • The method allows for in situ observation of protein-ligand interactions under near-native conditions.
    • This imaging approach can aid in interpreting functional studies of membrane proteins.