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FEBS Lett. 2012 Jan 20;586(2):169-73. doi: 10.1016/j.febslet.2011.12.010. Epub 2011 Dec 17.

Lifetimes of photosystem I and II proteins in the cyanobacterium Synechocystis sp. PCC 6803.

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School of Life Sciences and Center for Bioenergy and Photosynthesis, Arizona State University, Tempe, AZ 85287-4501, USA.


The half-life times of photosystem I and II proteins were determined using (15)N-labeling and mass spectrometry. The half-life times (30-75h for photosystem I components and <1-11h for the large photosystem II proteins) were similar when proteins were isolated from monomeric vs. oligomeric complexes on Blue-Native gels, suggesting that the two forms of both photosystems can interchange on a timescale of <1h or that only one form of each photosystem exists in thylakoids in vivo. The half-life times of proteins associated with either photosystem generally were unaffected by the absence of Small Cab-like proteins.

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