Supramolecular photosystem II organization in grana thylakoid membranes: evidence for a structured arrangement

Biochemistry
Helmut KirchhoffUlrich Kubitscheck

Abstract

The distribution of photosystem (PS) II complexes in stacked grana thylakoids derived from electron microscopic images of freeze-fractured chloroplasts are examined for the first time using mathematical methods. These characterize the particle distribution in terms of a nearest neighbor distribution function and a pair correlation function. The data were compared with purely random distributions calculated by a Monte Carlo simulation. The analysis reveals that the PSII distribution in grana thylakoids does not correspond to a random protein mixture but that ordering forces lead to a structured arrangement on a supramolecular level. Neighboring photosystems are significantly more separated than would be the case in a purely random distribution. These results are explained by structural models, in which boundary lipids and light-harvesting complex (LHC) II trimers are arranged between neighboring PSII. Furthermore, the diffusion of PSII was analyzed by a Monte Carlo simulation with a protein density of 80% area occupation (determined for grana membranes). The mobility of the photosystems is severely reduced by the high protein density. From an estimate of the mean migration time of PSII from grana thylakoids to stroma lamellae, i...Continue Reading

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Citations

Jan 13, 2010·Journal of Bioenergetics and Biomembranes·Tomas MorosinottoRoberto Bassi
Jun 25, 2013·Photosynthesis Research·Julia ZaksGraham R Fleming
Aug 21, 2013·Photosynthesis Research·Radek Kaňa
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Dec 1, 2011·Proceedings of the National Academy of Sciences of the United States of America·Helmut KirchhoffZiv Reich
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Sep 4, 2008·Photochemistry and Photobiology·Conrad W Mullineaux
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