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- W2021993435 abstract "We have studied the structure of lysozyme as influenced by solution environment using small-angle X-ray scattering (SAXS). With an ellipsoid form factor and a structure factor derived using the mean spherical approximation to account for the electrostatic repulsion of lysozyme, we have extracted detailed structural information about the protein in aqueous solutions, including the size, shape, and net charge number. The SAXS data analysis shows that lysozyme in pure water, expressing an averaged net charge number of ~6, folds to an ellipsoid-like shape with a radius of gyration Rg = 16.6 Å. Temperature-dependent SAXS for lysozyme in a buffer solution in which charge repulsion has been eliminated suggests that the protein may thermally unfold gradually along a preferred direction from the ellipsoidal shape with an aspect ratio of p ≃ 2 at 303 K to an elongated shape with p ≃ 3 at 343 K. The structural parameters of the unfolded lysozyme obtained using model fitting are compared with the envelope morphology simulated using a dummy-residues model. From the evolution of the volume of lysozyme during the thermal unfolding process, we deduce a free-energy profile for the protein thermally unfolded in water using a modified Ising model on the basis of a mean field approximation." @default.
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- W2021993435 date "2007-02-10" @default.
- W2021993435 modified "2023-10-16" @default.
- W2021993435 title "Charge interaction and temperature effects on the solution structure of lysozyme as revealed by small-angle X-ray scattering" @default.
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- W2021993435 doi "https://doi.org/10.1107/s0021889807001835" @default.
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