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A general method for plasma membrane isolation by colloidal gold density shift

T L Steck1, M Lavasa

  • 1Department of Biochemistry and Molecular Biology, University of Chicago, Illinois 60637.

Analytical Biochemistry
|November 15, 1994
PubMed
Summary
This summary is machine-generated.

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Researchers developed a new method to isolate plasma membranes using gold colloid. This technique offers improved yield and purity for studying cell membranes.

Area of Science:

  • Cell Biology
  • Biochemistry
  • Membrane Biology

Background:

  • Plasma membrane isolation is crucial for understanding cellular functions.
  • Existing methods for plasma membrane isolation can be complex and yield low purity.

Purpose of the Study:

  • To develop a novel, efficient, and general method for isolating plasma membranes from Dictyostelium discoideum.
  • To characterize the purity and yield of the isolated plasma membranes.

Main Methods:

  • Utilized colloidal gold particles (10-20 nm) to label the plasma membrane surface of Dictyostelium discoideum.
  • Employed a sucrose density gradient centrifugation technique to pellet gold-laden membranes after cell lysis.
  • Tracked plasma membrane enrichment using exogenous markers: [3H]cholesterol, octadecylrhodamine, and the gold colloid itself.

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Main Results:

  • The novel method achieved approximately 60% recovery of plasma membrane markers with a 15-fold enrichment relative to protein.
  • Contaminating organelle markers (lysosomes, mitochondria, endoplasmic reticulum, DNA) showed minimal enrichment.
  • Membrane proteins and lipids were effectively solubilized from the gold particles using detergents.

Conclusions:

  • This gold-based methodology provides a facile and effective approach for plasma membrane isolation.
  • The technique demonstrates favorable yield, purity, and ease of use compared to existing methods.
  • The isolated membranes are suitable for further biochemical and lipid analysis.