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On the influence of the lipid matrix on energy transfer processes in self assembling chlorophyll lipid systems

, : On the influence of the lipid matrix on energy transfer processes in self assembling chlorophyll lipid systems. Biochimica et Biophysica Acta 938(1): 71-78

Life-time measurements for chlorophyll a and pheophytin a in lipid vesicles of digalactosyldiacylglycerol (DGDG) and sulfoquinovosyldiacylglycerol (SQDG) at different pigment-lipid ratios are presented. On increasing the pigment concentration weakly fluorescent dimers are formed, to which the excited state energy is transferred, thus causing a shortening of the average lifetime. This quenching behaviour is less efficient for chlorophyll a in sulfoquinovosyldiacylglycerol than in digalactosyldiacylglycerol, but no differences are found for pheophytin a in sulfoquinovosyldiacylglycerol and digalactosyldiacylglycerol. It is suggested that the negatively charged headgroup of sulfoquinovosyldiacylglycerol bonds with the Mg2+ of chlorophyll a, thus holding the chlorophylls apart and preventing them from forming aggregates. Large differences exist between the concentration quenching curves of chlorophyll a and pheophytin a. The significant lower quenching efficiency of the pheophytin a-lipid system is partly due to a smaller dimerization of pheophytin a molecules, but mainly to the mutual orientation of the monomers and dimers which leads to low energy transfer rates.

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