Phase Transition Behaviour of Monogalactosyldiacylglycerol

  • Peter J. Quinn
  • Leonard J. Lis


Monoglactosyldiacylglycerol is the major polar lipid component of the photosynthetic membrane and in higher plant chloroplasts it represents about half, by weight, of the total polar lipids. A particular feature of this lipid species is that, in certain plants such as bean and spinach, the fatty acyl composition is dominated by linolenic acid. This unusual polyunsaturated fatty acyl chain composition has been found to be a major factor in determining the phase behaviour of the lipid in aqueous systems (Gounaris et al., 1983). Studies of the fully saturated lipid species have been reported (Sen et al., 1983) which indicate the presence of metastable states. These states are characterized by decay rates that depend on the temperature and water content of the dispersion. This paper describes time-resolved X-ray diffraction experiments aimed to investigate phase transition behaviour in saturated m onogalactosyldiacylglycerol.


Phase Transition Behaviour Total Polar Lipid Exothermic Transition Fatty Acyl Residue High Plant Chloroplast 
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  1. Gounaris, K., Mannock, D.A., Sen, A., Brain, A.P.R., Williams, W.P. and Quinn, P.J., 1983, Polyunsaturated fatty acyl residues of galactolipids are involved in the control of bilayer/non-bilayer lipid transitions in higher plant chloroplasts, Biochim. Biophys. Acta, 732: 229.CrossRefGoogle Scholar
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  5. Sen, A., Mannock, D.A., Collins, D.J., Quinn, P.J. and Williams, W.P., 1983, Thermotropic phase properties and structure of 1, 2-distearoyl-galactosylglycerols in aqueous media, Proc. R. Soc. Lond. B, 218: 349CrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1987

Authors and Affiliations

  • Peter J. Quinn
    • 1
  • Leonard J. Lis
    • 2
  1. 1.Department of BiochemistryKing’s College LondonCampden Hill, LondonUK
  2. 2.Physics DepartmentKent State UniversityKentUSA

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