A time-resolved synchrotron X-ray study of a crystalline phase bilayer transition and packing in a saturated monogalactosyldiacylglycerol-water system |
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| Institution: | 1. Department of Biochemistry, King''s College London, London W8 7AH U.K.;2. Department of Physics and Liquid-Crystal Institute, Kent State University, Kent, OH 44242, U.S.A.;1. School of Food and Biological Engineering, Key Laboratory of Metabolism and Regulation for Major Diseases of Anhui Higher Education Institutes, Hefei University of Technology, Hefei, 230009, PR China;2. CAS Key Laboratory of Photovoltaic and Energy Conservation Materials, Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, PR China;3. CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, PR China;4. School of Materials Engineering, Jinling Institute of Technology, Nanjing 211169, PR China;1. CAS Key Laboratory of Photovoltaic and Energy Conservation Materials, Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui 230031, PR China;2. University of Science and Technology of China, Hefei, Anhui 230026, PR China;3. Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Soochow University, Suzhou 215123, PR China |
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| Abstract: | The structural changes associated with a phase transition between the gel-phase bilayer (Lβ) in which the acyl chains pack in a hexagonal subcell, and a crystalline bilayer phase (LC1) where the acyl chains are packed in an orthorhombic subcell in a saturated monogalactosyldiacylglycero-water system are reported. The phase change is cooperative and takes place isothermally after the lamellar-gel phase has been held at 20°C for about 8 min. The transformation of the acyl chain subcell from hexagonal to orthorhombic induces a change in diffraction maxima observed in the region 0.6–0.7 nm which is interpreted as a change in packing of the galactose residues from an orthorhombic to hexagonal subcell. We conclude that the rearrangement of the acyl chains into a more closely packed subcell requires the head groups to reorient to reduce the steric hindrance between the bulky galactose residues. |
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