Pressure-induced phase changes of cubic monoolein - Cytochrome C mesophases |
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Authors: | J Lendermann R Winter |
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Institution: | Department of Chemistry, Physical Chemistry I , University of Dortmund , Otto-Hahn Str. 6, Dortmund , D-44221 , Germany |
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Abstract: | Incorporation of the protein cytochrome c (cyt c) into the hydrated bicontinuous Ia3d cubic mesophase of monoolein (MO) was investigated within a wide range of pressures by small-angle X-ray scattering (SAXS). We found that incorporation of cyt c into the cubic phase of MO has a drastic effect on the structure and pressure stability of the system: At high pressures, the lipid systems with less than 0.2 wt.% embedded protein undergo a transition to a fluid lamellar phase with smaller partial molar lipid volume. Incorporation of cyt c at levels above 0.2 wt.% promotes the formation of a new cubic phase, probably a cubic micellar phase of space group P4332 (Q212) whose pressure stability rises with increasing protein content. |
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Keywords: | Lipids Cubic Mesophases Monoolein Cytochrome c Pressure Saxs |
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