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.
|crystal structure of photosystem i: a photosynthetic reaction center and core antenna system from cyanobacteria|
Other articles related to "photosystem i, photosystem, photosystems":
... After the electron has left photosystem II it is transferred to a cytochrome b6f complex and then to plastocyanin, a blue copper protein and ... the pair in the next reaction centre, photosystem I ... As with photosystem II and the bacterial reaction centre, a pair of chlorophyll a molecules initiates photoinduced charge separation ...
... Molecular data show that PS I likely evolved from the photosystems of green-sulfur bacteria ... The photosystems of green sulfur bacteria and those of cyanobacteria, algae, and higher plants are not the same, however there are many analogous functions and similar structures ... Three main features are similar between the different photosystems ...