Journal Article

Novel Supercomplex Organization of Photosystem I in <i>Anabaena</i> and <i>Cyanophora paradoxa</i>

Mai Watanabe, Hisako Kubota, Hajime Wada, Rei Narikawa and Masahiko Ikeuchi

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 52, issue 1, pages 162-168
Published in print January 2011 | ISSN: 0032-0781
Published online November 2010 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcq183
Novel Supercomplex Organization of Photosystem I in Anabaena and Cyanophora paradoxa

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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 N2-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.

Keywords: Anabaena; Blue-native PAGE; Cyanophora paradoxa; PSI; Supercomplex

Journal Article.  3583 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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