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Published on: July 27, 2017
N-Myristoylated Phosphatidylethanolamine: Interfacial Behavior and Interaction with Cholesterol
Xin-Min Li1, M Ramakrishnan, Howard L Brockman
1The Hormel Institute, University of Minnesota, Austin, Minnesota 55912, and School of Chemistry, University of Hyderabad, Hyderabad - 500 046, India.
Langmuir : the ACS Journal of Surfaces and Colloids
|November 2, 2010
Summary
This study characterized N-myristoyldimyristoylphosphatidylethanolamine (N-14:0 DMPE) and its interaction with cholesterol. N-14:0 DMPE shows unique 2D phase transitions, and its mixing with cholesterol deviates from ideal behavior, suggesting complex lipid interactions.
Area of Science:
- Biophysics
- Materials Science
- Surface Chemistry
Background:
- Phospholipids are key components of biological membranes.
- Understanding lipid packing and interactions is crucial for membrane function.
Purpose of the Study:
- To characterize the interfacial packing of N-myristoyldimyristoylphosphatidylethanolamine (N-14:0 DMPE).
- To investigate the interaction of N-14:0 DMPE with cholesterol.
- To compare N-14:0 DMPE behavior with dimyristoylphosphatidylethanolamine (DMPE).
Main Methods:
- Utilized an automated Langmuir film balance to monitor surface pressure and potential.
- Analyzed lipid cross-sectional molecular area, surface compressional moduli, and dipole moments.
- Investigated phase transitions and mixing behavior under varying temperatures and pressures.
Main Results:
- N-14:0 DMPE exhibited distinct 2D phase transitions (liquid-expanded to condensed) across temperatures.
- Calcium ions (Ca2+) shifted the 2D transition onset pressure for N-14:0 DMPE.
- Mixing with cholesterol induced a condensing effect, with maximal condensation near equimolar ratios.
- Complex mixing patterns deviating from ideal behavior were observed, suggesting lipid complexes or liquid-ordered phases.
Conclusions:
- N-14:0 DMPE displays unique interfacial behavior compared to DMPE.
- Cholesterol significantly influences N-14:0 DMPE packing, forming complex structures.
- Findings provide insights into lipid organization relevant to biomembrane models.
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