Structure and functional role of supercomplexes of IsiA and Photosystem I in cyanobacterial photosynthesis.
FEBS Lett
; 579(15): 3253-7, 2005 Jun 13.
Article
em En
| MEDLINE
| ID: mdl-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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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Fotossíntese
/
Proteínas de Bactérias
/
Cianobactérias
/
Complexos de Proteínas Captadores de Luz
/
Complexo de Proteína do Fotossistema I
Idioma:
En
Revista:
FEBS Lett
Ano de publicação:
2005
Tipo de documento:
Article