Structure and functional role of supercomplexes of IsiA and Photosystem I in cyanobacterial photosynthesis

Roman Kouřil, Ana A. Arteni, Julia Lax, Nataliya Yeremenko, Sandrine D' Haene, Matthias Rögner, Hans C.P. Matthijs, Jan P. Dekker, Egbert J. Boekema

OnderzoeksoutputAcademic

74 Citaten (Scopus)
364 Downloads (Pure)

Samenvatting

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.
Originele taal-2English
Pagina's (van-tot)3253 - 3257
Aantal pagina's5
TijdschriftFEBS Letters
Volume579
Nummer van het tijdschrift15
DOI's
StatusPublished - 2005

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