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Related Experiment Videos

Protein lateral mobility as a reflection of membrane microstructure

F Zhang1, G M Lee, K Jacobson

  • 1Department of Cell Biology and Anatomy, University of North Carolina at Chapel Hill 27599-7090.

Bioessays : News and Reviews in Molecular, Cellular and Developmental Biology
|September 1, 1993
PubMed
Summary

Lateral mobility of membrane proteins is crucial for cell function. New microscopy techniques help explain why some proteins move slower in cell membranes compared to artificial ones.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Membrane Dynamics

Background:

  • Lateral mobility of membrane lipids and proteins is essential for biomembrane function.
  • Photobleaching studies reveal significantly lower protein diffusion coefficients in plasma membranes compared to artificial bilayers.
  • Both cytoplasmic and ectodomain regions can influence protein lateral mobility.

Purpose of the Study:

  • To investigate the factors affecting lateral mobility of membrane proteins.
  • To reconcile discrepancies between in vivo and in vitro protein diffusion measurements.
  • To elucidate the role of protein domains in determining lateral mobility.

Main Methods:

  • Utilizing photobleaching studies to assess protein diffusion.
  • Employing single particle tracking microscopy to follow individual membrane molecule movements.

Related Experiment Videos

  • Comparing protein mobility in native plasma membranes and artificial bilayer membranes.

    • Main Results:

    • Single particle tracking microscopy reveals new insights into membrane dynamics.
    • This technique helps explain the "immobile fraction" observed in photobleaching studies.
    • Differences in mobility are linked to specific protein domains.

    Conclusions:

    • Combining photobleaching and single particle tracking enhances understanding of membrane microstructure.
    • Protein domains play a critical role in regulating lateral mobility within the plasma membrane.
    • Further research using these complementary techniques will advance the study of biomembrane dynamics.