The effect of polydispersity, shape fluctuations and curvature on small unilamellar vesicle small-angle X-ray scattering curves

Chappa, V.; Smirnova, Y.; Komorowski, K.; Müller, M.; Salditt, T.

doi:10.1107/S1600576721001461

Journal of Applied Crystallography Journal of Applied
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Figure 3
(a) Electron-density contrast of a planar bilayer patch (orange dashed line) and an 8 nm vesicle (blue solid line) of POPC lipids obtained by MD simulations, and fitted curves using equation (1)

(dashed–dotted lines). The difference between vesicle and planar membrane electron densities is shown by the green dotted line. (b) Anti-symmetric, d₀/R₀ Δρ_a(d) (red dashed line), and symmetric, (d₀/R₀)²Δρ_s(d) (violet solid line), responses of the electron density to curvature (green dotted line). (c) Electron-density model of a vesicle of arbitrary radius R₀ > 8 nm, as given by equation (2)

. (d) Electron-density contrast of vesicles with R₀ = 8 nm and R₀ = 30 nm obtained with the curvature-dependent model, equation (2)

(blue and red dashed lines, respectively), and the curvature-independent three-Gaussian model, equation (4)

(blue and red solid lines, respectively).

JOURNAL OF
APPLIED
CRYSTALLOGRAPHY

ISSN: 1600-5767

Volume 54| Part 2| April 2021| Pages 557-568

https://doi.org/10.1107/S1600576721001461

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