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Plant Cell Physiol. 2011 Jan;52(1):162-8. doi: 10.1093/pcp/pcq183. Epub 2010 Nov 29.

Novel supercomplex organization of photosystem I in Anabaena and Cyanophora paradoxa.

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Department of Life Sciences, University of Tokyo, Komaba, Meguro, Tokyo, Japan.


The supercomplex organization of photosystem complexes was studied in various cyanobacteria, a glaucocystophyte and a primitive rhodophyte by blue-native PAGE with a wide range of detergent concentrations. In contrast to known cyanobacteria that produced the PSI trimer, a filamentous N(2)-fixing cyanobacterium Anabaena sp. PCC 7120 and a glaucocystophyte Cyanophora paradoxa NIES 547 had a PSI tetramer and dimer but no trimer at all. This was confirmed by sucrose density gradient centrifugation. A primitive rhodophyte Cyanidioschyzon merolae had two species of PSI monomeric complex with a light-harvesting Chl complex of a different composition. These results are discussed with regard to the evolution of the PSI supercomplex.

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