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CoenzymeQ10 localizations in model membranes. A Langmuir monolayer study
Willy Nerdal1, Torill Regine Sandvik Nilsen1, Signe Steinkopf2
1Department of Chemistry, University of Bergen, Allégaten 41, N-5007 Bergen, Norway.
Biophysical Chemistry
|September 27, 2015
Summary
Coenzyme Q10 (CoQ10) interacts with lipid monolayers, intercalating into DPPC, POPS, and pig brain lipids at biological concentrations. Higher CoQ10 levels induce domain formation, except in DEPC lipids where it promotes dense packing.
Area of Science:
- Biochemistry
- Materials Science
- Membrane Biophysics
Background:
- Coenzyme Q10 (CoQ10) is vital for cellular energy production.
- Lipid monolayers serve as simplified models for cell membranes.
- Understanding CoQ10's interaction with lipids is crucial for its biological roles.
Purpose of the Study:
- To investigate the interaction of CoQ10 with various phospholipid monolayers.
- To determine the effect of CoQ10 concentration on lipid packing and organization.
- To elucidate the molecular behavior of CoQ10 within different lipid environments.
Main Methods:
- Langmuir monolayer technique was employed.
- Surface pressure-mean molecular area (π-mma) isotherms were measured.
- CoQ10 was incorporated into DPPC, DEPC, POPS, and pig brain lipid monolayers at varying concentrations (0.5–10.0 mol%).
Main Results:
- CoQ10 intercalates into DPPC, POPS, and pig brain lipid acyl chains at biological concentrations (1.0–3.0 mol%).
- Above biological concentrations, CoQ10 induces domain formation in DPPC, POPS, and pig brain lipid monolayers.
- DEPC monolayers exhibit unique behavior: CoQ10 promotes dense packing at 2.0 mol% and aligns parallel to DEPC acyl chains across all concentrations.
Conclusions:
- CoQ10's interaction with lipid monolayers is concentration-dependent and lipid-specific.
- The study reveals distinct molecular arrangements of CoQ10 within different lipid bilayers.
- Findings contribute to understanding CoQ10's membrane integration and potential effects on membrane properties.
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