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Tuning the membrane surface potential for efficient toxin import.

Stanislav D Zakharov1, Tatyana I Rokitskaya, Vladimir L Shapovalov

  • 1Department of Biological Sciences, Purdue University, West Lafayette, IN 47907-1392, USA. zakharos@purdue.edu

Proceedings of the National Academy of Sciences of the United States of America
|June 13, 2002
PubMed
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Membrane surface charge is crucial for colicin E1 import and channel formation. Optimal protein insertion and function depend on specific anionic lipid content and membrane surface potential.

Area of Science:

  • Biophysics
  • Membrane Biology
  • Protein Import

Background:

  • Membrane surface electrostatics influence protein structure and function.
  • Colicin E1's C-terminal domain forms voltage-gated channels, sensitive to membrane environment.

Purpose of the Study:

  • Investigate the role of membrane surface electrostatic interactions in colicin E1 import and channel formation.
  • Determine the optimal anionic lipid content and surface potential for channel activity.

Main Methods:

  • Electrophysiology to measure channel current.
  • Varying anionic lipid content (dioleoyl-phosphatidylglycerol) in model membranes.
  • Surface potential measurements.
  • Thermal denaturation studies to assess protein flexibility.

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Main Results:

  • Significant channel current observed within a narrow anionic lipid concentration range (25-30 mol%).
  • Maximum current (I(max)) occurred at a surface potential (ψ(o)max) of -60 ± 5 mV.
  • Higher ionic strength shifted optimal lipid content but not surface potential.
  • Loss of polypeptide flexibility observed at higher surface potentials (>65 mV).

Conclusions:

  • Membrane surface potential is finely tuned to facilitate colicin E1 insertion and channel formation.
  • Electrostatic interactions are critical for both insertion and maintaining flexibility.
  • The optimal conditions mimic those found in the Escherichia coli cytoplasmic membrane.