PMID: 11607092Jul 1, 1990Paper

Distribution and self-organization of photosynthetic pigments in micelles: implication for the assembly of light-harvesting complexes and reaction centers in the photosynthetic membrane

Proceedings of the National Academy of Sciences of the United States of America
A ScherzJ R Fisher

Abstract

The addition of bacteriochlorophylls and bacteriopheophytins to formamide/water, 3:1 (vol/vol), (or water) containing small spherical micelles of Triton X-100 leads to the reorganization of the detergent into micelles that consist of 5000-40,000 amphiphilic molecules. The pigment distribution within the micelles was determined by modified Poisson statistics taking into consideration the various sizes of micelles. Pigment dimerization occurred in micelles with more than a single occupant and was driven by a free-energy change of -4.5 kcal/mol (1 cal = 4.184 J) for bacteriochlorophyll a in formamide/water, -7.6 kcal/mol for bacteriopheophytin a in formamide/water, and -6.6 kcal/mol for bacteriopheophytin a in water. These values correspond to the room temperature equilibrium constants 2.2 x 10(3) M-1, 3.9 x 10(5) M-1, and 7.5 x 10(4) M-1, respectively. The incorporation of bacteriochlorophylls with attached small formamide polymers and the subsequent dimerization of these pigments in the lipid phase provide a model for studying the synergetic organization of polypeptides and bacteriochlorophyll clusters in the photosynthetic membrane.

References

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Citations

Jan 11, 2018·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Rui LiuJonathan S Lindsey
Apr 1, 1992·European Journal of Biochemistry·H Paulsen, S Hobe
Sep 3, 2009·The Journal of Physical Chemistry. B·Joanna FiedorLeszek Fiedor

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