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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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