4.7 Article

Novel Supercomplex Organization of Photosystem I in Anabaena and Cyanophora paradoxa

Journal

PLANT AND CELL PHYSIOLOGY
Volume 52, Issue 1, Pages 162-168

Publisher

OXFORD UNIV PRESS
DOI: 10.1093/pcp/pcq183

Keywords

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

Funding

  1. Ministry of Education and Science

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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 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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