Structure and function of photosystem I: interaction with its soluble electron carriers and external antenna systems.
Photosystem I (PS I) is a large membrane protein complex that catalyzes the first step of solar conversion, the light-induced transmembrane electron transfer, and generates reductants for CO2 assimilation. It consists of 12 different proteins and 127 cofactors that perform light capturing and electron transfer. The function of PS I includes inter-protein electron transfer between PS I and smaller soluble electron transfer proteins. The structure of PS I is discussed with respect to the potential docking sites for the soluble electron acceptors, ferredoxin/flavodoxin, at the stromal side and the soluble electron donors, cytochrome c6/plastocyanin, at the luminal side of the PS I complex. Furthermore, the potential interaction sites with the peripheral antenna proteins are discussed.
Fromme
Petra
P
Department of Chemistry and Biochemistry, Arizona State University, P.O. Box 871604, Tempe, AZ 85287-1604, USA. pfromme@asu.edu
Melkozernov
Alexander
A
Jordan
Patrick
P
Krauss
Norbert
N
D001665:Binding Sites; D045365:Cytochromes c6 / Q000737:chemistry; D004579:Electron Transport; D005288:Ferredoxins / Q000737:chemistry; D005418:Flavodoxin / Q000737:chemistry; D046911:Macromolecular Substances; D008958:Models, Molecular; D045331:Photosystem I Protein Complex / Q000737:chemistry* / Q000378:metabolism*; D010970:Plastocyanin / Q000737:chemistry; D012995:Solubility; D055672:Static Electricity
D045365:Cytochromes c6; D005288:Ferredoxins; D005418:Flavodoxin; D046911:Macromolecular Substances; D045331:Photosystem I Protein Complex; D010970:Plastocyanin