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Published on December 24, 2008; 10.1104/pp.108.132373

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Received November 10, 2008
Accepted December 18, 2008

Thylakoid membrane reduction affects the photosystem stoichiometry in the cyanobacterium Synechocystis sp. PCC 6803

Eva Fuhrmann , Sven Gathmann , Eva Rupprecht , Jochen Golecki , and Dirk Schneider *

Institut fur Biochemie und Molekularbiologie, ZBMZ, Albert-Ludwigs-Universitat Freiburg, Stefan-Meier-Strasse 17, 79104 Freiburg, Germany; Fakultat fur Biologie, Albert-Ludwigs-Universitat Freiburg, 79104 Freiburg

* Corresponding author; email: dirk.schneider{at}biochemie.uni-freiburg.de.

Biogenesis of thylakoid membranes in both chloroplasts and cyanobacteria is largely not understood today. The vesicle inducing protein in plastids 1 (Vipp1) has been suggested to be essential for thylakoid membrane formation in Arabidopsis thaliana as well as in the cyanobacterium Synechocystis sp. PCC 6803, although its exact physiological function remains elusive so far. Here we report that upon depletion of Vipp1 in Synechocystis cells the number of thylakoid layers in individual Synechocystis cells decreased, and that especially the content of photosystem 1 complexes was highly diminished in thylakoids. Furthermore, separation of native photosynthetic complexes indicated that photosystem 1 trimers are destabilized and the monomeric species is enriched. Therefore, depletion of thylakoid membranes specifically affects biogenesis and/or stabilization of photosystem 1 in cyanobacteria.






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