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Vesicle trafficking and cell surface membrane patchiness.

Q Tang1, M Edidin

  • 1Department of Biology, The Johns Hopkins University, Baltimore, Maryland 21218, USA.

Biophysical Journal
|June 26, 2001
PubMed
Summary
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Cell surface protein patches may not be membrane domains. Inhibiting vesicle trafficking caused protein patches to enlarge and fade, supporting a model of patchiness due to vesicle movement and mobility barriers.

Area of Science:

  • Cell Biology
  • Membrane Biophysics
  • Immunology

Background:

  • Cell surface proteins and lipids often form patchy distributions.
  • These patches are frequently interpreted as specific membrane domains.
  • A computational model suggests patchiness may arise from vesicle trafficking and mobility barriers.

Purpose of the Study:

  • To investigate whether vesicle trafficking influences the formation and stability of membrane protein patches.
  • To test the prediction that inhibiting vesicle trafficking alters protein patch characteristics.

Main Methods:

  • Class I HLA molecules (integral membrane proteins) were studied.
  • Endocytic vesicle traffic was inhibited using hypertonic medium or dominant-negative dynamin.
  • Apparent sizes and intensities of HLA patches were compared before and after inhibition.

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Main Results:

  • Inhibition of endocytosis and vesicle trafficking led to an increase in the apparent size of HLA patches.
  • The intensity of these patches decreased after vesicle trafficking inhibition.
  • Results align with the simulation's prediction of patch decay upon trafficking inhibition.

Conclusions:

  • Membrane protein patchiness may be significantly influenced by vesicle trafficking dynamics rather than solely by static membrane domains.
  • The findings challenge the assumption that all observed protein patches represent distinct membrane domains.
  • Vesicle trafficking plays a crucial role in maintaining the observed distribution patterns of cell surface proteins.