Photosystem I (PS I) (or plastocyanin: ferredoxin oxidoreductase) is the second photosystem in the photosynthetic light reactions of algae, plants, and some bacteria. Photosystem I is so named because it was discovered before photosystem II. Aspects of PS I were discovered in the 1950s, but the significances of these discoveries was not yet known. Louis Duysens first proposed the concepts of photosystems I and II in 1960, and, in the same year, a proposal by Fay Bendall and Robert Hill assembled earlier discoveries into a cohesive theory of serial photosynthetic reactions. Hill and Bendall’s hypothesis was later justified in experiments conducted in 1961 by Duysens and Witt groups.
PsaA_PsaB | |||||||||
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crystal structure of photosystem i: a photosynthetic reaction center and core antenna system from cyanobacteria | |||||||||
Identifiers | |||||||||
Symbol | PsaA_PsaB | ||||||||
Pfam | PF00223 | ||||||||
InterPro | IPR001280 | ||||||||
PROSITE | PDOC00347 | ||||||||
SCOP | 1jb0 | ||||||||
SUPERFAMILY | 1jb0 | ||||||||
TCDB | 5.B.4 | ||||||||
OPM superfamily | 2 | ||||||||
OPM protein | 1jb0 | ||||||||
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Read more about Photosystem I: Components and Action of Photosystem I, Ycf4 Protein Domain, Green Sulfur Bacteria and The Evolution of PS I