TABLE 5.
Diffusion parameters for ergosterol or cholesterol in DMPC bilayers at 313 K
| Diffusion axis parameters
|
||||
|---|---|---|---|---|
| α (°) | β (°) | Smol | Inertia-diffusion angle γI (°) | |
| DMPC/Ergosterol (mol/mol) | ||||
| 8.4:1.6 | 101 ± 5 | 89 ± 1 | 0.76 ± 0.02 | 15 ± 3 |
| 7.7:2.3 | 98 ± 5 | 88 ± 1 | 0.89 ± 0.02 | 13 ± 2 |
| 7.0:3.0 | 99 ± 5 | 88 ± 1 | 0.89 ± 0.02 | 14 ± 2 |
| DMPC/Cholesterol (mol/mol)* | ||||
| 7.0:3.0 | 91 ± 5 | 89 ± 1 | 0.94 ± 0.01 | 2 ± 2 |
The values α and β are the polar coordinates of the diffusion axis in the molecular frame M, Smol is the molecular order parameter. The value γI corresponds to the angle between the principal inertia axis 
of the sterol ring system (from C1 to C19 with bonded protons and oxygen) and the diffusion axis.
*
The polar coordinates in the molecular frame M correspond to (α = 11 ± 5°, β = 11 ± 1°) in the C3 molecular frame defined in Marsan et al. (22) for 7.0:3.0 (mol/mol) DMPC/cholesterol samples. Note that, in their publication, α is named γ.