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Dynamic control of protein diffusion within the granal thylakoid lumen

Helmut Kirchhoff, Chris Hall, Magnus Wood, Miroslava Herbstová, Onie Tsabari, Reinat Nevo, Dana Charuvi, Eyal Shimoni and Ziv Reich
Proceedings of the National Academy of Sciences of the United States of America
Vol. 108, No. 50 (December 13, 2011), pp. 20248-20253
Stable URL: http://www.jstor.org/stable/23060107
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Dynamic control of protein diffusion within the granal thylakoid lumen
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Abstract

The machinery that conducts the light-driven reactions of oxygenic photosynthesis is hosted within specialized paired membranes called thylakoids. In higher plants, the thylakoids are segregated into two morphological and functional domains called grana and stroma lamellae. A large fraction of the luminal volume of the granal thylakoids is occupied by the oxygen-evolving complex of photosystem II. Electron microscopy data we obtained on dark- and light-adapted Arabidopsis thylakoids indicate that the granal thylakoid lumen significantly expands in the light. Models generated for the organization of the oxygen-evolving complex within the granal lumen predict that the light-induced expansion greatly alleviates restrictions imposed on protein diffusion in this compartment in the dark. Experiments monitoring the redox kinetics of the luminal electron carrier plastocyanin support this prediction. The impact of the increase in protein mobility within the granal luminal compartment in the light on photosynthetic electron transport rates and processes associated with the repair of photodamaged photosystem II complexes is discussed.

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