Photosystem I trimers from Synechocystis PCC 6803 lacking the PsaF and PsaJ subunits bind an IsiA ring of 17 units.
Biochim Biophys Acta
; 1607(1): 1-4, 2003 Oct 17.
Article
en En
| MEDLINE
| ID: mdl-14556907
ABSTRACT
We report a structural characterization by electron microscopy and image analysis of a supramolecular complex consisting of Photosystem I (PSI) and the chlorophyll-binding protein IsiA from a mutant of the cyanobacterium Synechocystis PCC 6803 lacking the PsaF and PsaJ subunits. The circular complex consists of a central PSI trimer surrounded by a ring of 17 IsiA units, one less than in the wild-type supercomplex. We conclude that PsaF and PsaJ are not obligatory for the binding of the IsiA ring, and that the size of the PSI complex determines the number of IsiA units in the ring. The resulting number of 17 copies implies that each PSI monomer has a different association to the IsiA ring.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Proteínas Bacterianas
/
Cianobacterias
/
Cristalografía
/
Complejo de Proteína del Fotosistema I
Idioma:
En
Revista:
Biochim Biophys Acta
Año:
2003
Tipo del documento:
Article
País de afiliación:
Países Bajos