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Molecular Dynamics Simulations of Dodecylphosphocholine Micelles at Three Different Aggregate Sizes: Micellar Structure and Chain Relaxation
Abstract
We simulated micelles of 40 (M40), 54 (M54), and 65 (M65) dodecylphosphocholine (DPC) lipids in water for up to 15 ns and analyzed the system energetics, structure of the water/lipid interface, structure and dynamics of the lipid tails, and overall size and shape of the micelles. M54 and M65 are similar, being mostly spherical in shape with comparable tail order parameters, atom distributions, and solvent accessible areas, whereas M40 assumes a prolate ellipsoid shape with a larger hydrophobic solvent accessible area per lipid and more restricted lipid packing. A comparison of the lipid chain structure and dynamics with those of decane and dipalmitoylphosphatidylcholine (DPPC) shows that the trans dihedral fractions are comparable, but that the dihedral transition rate is considerably slower in the micelles than in decane or DPPC, in agreement with a previous simulation of the sodium dodecyl sulfate micelle but in contrast with a recent simulation of DPC. The relaxation behavior of the CH 2 segments in the lipid chains is complex, and the overall and internal motions of the lipids cannot be separated. The full orientational autocorrelation function of the CH vectors is calculated and found to decay to zero within a few nanoseconds, which is fast compared to overall micellar rotation. From a direct calculation of the spectral densities, 13 C T 1 and T 2 relaxation times of the tail carbons are calculated and found to agree well with experimental measurements for the lipid chain carbons, but less well for the headgroup.
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Metadata
- Authors
- Tieleman, D. P., van der Spoel, D., & Berendsen, H. J. C.
- Venue
- The Journal of Physical Chemistry B
- Publisher
- American Chemical Society (ACS)
- Published
- 2000-06-17
- Volume
- 104
- Issue
- 27
- Pages
- 6380-6388
- ISSN
- 1520-5207 (ISSN-L)
- 1520-6106
- OpenAlex
- W2124347634
- Cited by
- 288
- References
- 20
- FWCI
- 2.70
- Type
- journal article
- Language
- en
- Open access
- closed
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