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Molecular dynamics simulation of a phospholipid micelle
J J Wendoloski1, S J Kimatian, C E Schutt
1E. I. du Pont de Nemours & Company, Central Research and Development Department, Wilmington, DE 19880.
Science (New York, N.Y.)
|February 3, 1989
Summary
Molecular dynamics simulations reveal how hydrated lysophosphatidylethanolamine (LPE) micelles change over time. These simulations show dynamic structural shifts, mimicking a pretransition from spherical to cylindrical micelle forms.
Area of Science:
- Biochemistry
- Molecular Biology
- Physical Chemistry
Background:
- Phospholipid aggregates exhibit dynamic behavior, complicating traditional structural analysis.
- Existing methods often yield only average molecular features, limiting detailed structural understanding.
Purpose of the Study:
- To develop more detailed descriptions of phospholipid structure using molecular dynamics simulations.
- To compare simulated micelle structures with experimental data.
Main Methods:
- Molecular dynamics simulation of a hydrated lysophosphatidylethanolamine (LPE) micelle.
- Incorporation of 85 LPE molecules and 1591 water molecules in the simulation.
Main Results:
- Significant differences observed between initial and equilibrated LPE micelles.
- Changes noted in LPE hydrocarbon chain conformation and head-group-solvent interactions.
- Alterations in hydrocarbon chain packing and head-group solvation were identified.
Conclusions:
- Simulated structural changes mimic a polymorphic pretransition.
- The study suggests a shift from spherical toward cylindrical micelle structures.
- Dynamic simulations provide insights beyond averaged structural properties.