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Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy
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Intermediate structures in the cholate-phosphatidylcholine vesicle-micelle transition.

A Walter1, P K Vinson, A Kaplun

  • 1Department of Physiology and Biophysics, Wright State University, Dayton, Ohio 45435.

Biophysical Journal
|May 12, 2009
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Summary

Researchers visualized the transition from vesicles to micelles using egg phosphatidylcholine (PC) and sodium cholate. They identified intermediate structures like bilayer sheets and cylindrical micelles, crucial for understanding membrane protein reconstitution.

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Area of Science:

  • Biophysics
  • Materials Science
  • Biochemistry

Background:

  • Egg phosphatidylcholine (PC) forms vesicles, while sodium cholate is a bile salt used to solubilize membrane proteins.
  • Understanding the transition between vesicular and micellar states is critical for membrane protein studies.

Purpose of the Study:

  • To elucidate the structural pathway and intermediate morphologies during the vesicle-micelle transition of egg PC and sodium cholate.
  • To provide direct evidence of molecular intermediates in the lamellar-to-micellar transition.

Main Methods:

  • Cryo-transmission electron microscopy (cryo-TEM) to visualize structures.
  • Turbidity measurements to monitor phase transitions.
  • Varying concentrations of sodium cholate with egg PC.

Main Results:

  • Observed structural changes with increasing cholate concentration, including altered vesicle size and multilamellar vesicles.
  • Identified three key intermediates: open vesicles, large bilayer sheets, and flexible cylindrical micelles.
  • Cylindrical micelles were seen to form from bilayer sheet edges, transitioning to small spheroidal micelles at higher cholate concentrations.

Conclusions:

  • This study provides the first direct visualization of the structural pathway between lamellar and micellar states.
  • Understanding these intermediates is essential for accurate reconstitution protocols and analysis of cholate-dispersed membrane proteins.