Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
2052847 | FEBS Letters | 2005 | 5 Pages |
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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Authors
Roman Kouřil, Ana A. Arteni, Julia Lax, Nataliya Yeremenko, Sandrine D’Haene, Matthias Rögner, Hans C.P. Matthijs, Jan P. Dekker, Egbert J. Boekema,