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  • Title: Structure and functional role of supercomplexes of IsiA and Photosystem I in cyanobacterial photosynthesis.
    Author: Kouril R, Arteni AA, Lax J, Yeremenko N, D'Haene S, Rögner M, Matthijs HC, Dekker JP, Boekema EJ.
    Journal: FEBS Lett; 2005 Jun 13; 579(15):3253-7. PubMed ID: 15943969.
    Abstract:
    Cyanobacteria express large quantities of the iron stress-inducible protein IsiA under iron deficiency. IsiA can assemble into numerous types of single or double rings surrounding Photosystem I. These supercomplexes are functional in light-harvesting, empty IsiA rings are effective energy dissipaters. Electron microscopy studies of these supercomplexes show that Photosystem I trimers bind 18 IsiA copies in a single ring, whereas monomers may bind up to 35 copies in two rings. Work on mutants indicates that the PsaF/J and PsaL subunits facilitate the formation of closed rings around Photosystem I monomers but are not obligatory components in the formation of Photosystem I-IsiA supercomplexes.
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