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Proton lateral conduction along a lipid monolayer spread on a physiological subphase
B Gabriel1, M Prats, J Teissié
1Laboratoire de pharmacologie et toxicologie fondamentales du CNRS, Département III-Glycoconjugués et Biomembranes, Toulouse, France.
Biochimica Et Biophysica Acta
|July 29, 1994
Summary
A localized proton pathway exists along phospholipid heads and water molecules at the air/water interface. This finding supports localized proton circuits and gradients within cell membranes.
Area of Science:
- Biophysics
- Membrane Biophysics
- Physical Chemistry
Background:
- Cellular membranes utilize proton gradients for energy.
- Understanding proton transport mechanisms is crucial for cell function.
- Lipid-water interfaces play a role in biological processes.
Purpose of the Study:
- To investigate the existence and nature of proton pathways at lipid monolayers.
- To determine if proton conduction occurs at physiological buffer concentrations.
- To explore the implications for localized proton circuits in membranes.
Main Methods:
- Spreading of phospholipid monolayers at the air/water interface.
- Detection of proton conduction under varying buffer conditions.
- Analysis of proton movement along lipid polar heads and associated water molecules.
Main Results:
- A localized lateral proton pathway was identified along phospholipid polar heads and bound water.
- Proton conduction was detectable in concentrated buffers, mimicking physiological conditions.
- The magnitude of the lateral proton gradient influenced conduction detection.
Conclusions:
- Localized lateral proton pathways facilitate proton movement at lipid-water interfaces.
- Microlocalized proton circuits and lateral proton gradients can occur along membranes.
- This mechanism may contribute to cellular energy transduction and signaling.