Succession of Co-factors in Photosystem I
The succession of co-factors in PS I-type reaction centers (RCs) from anoxygenic photosynthesis into oxygenic photosynthesis was considered from the viewpoint of the molecular\ structures. In the PS I-type RCs, BChl g succeeded to Chl a. The epimers of BChl g and Chl a, BChl g' and Chl a', function as the primary electron donors in respective organisms. In Acaryochloris marina PS I, Chl d' function as the primary electron donor. The primary electron acceptors of PS I, A0, are Chl a derivatives even in anoxygenic photosynthesis. The secondary electron acceptors in the PS I-type RCs, A1, are naphtoquinone molecules, and side chains are modified after the origin of cyanobacteria, leading to succession from menaquinone to phylloquinone in oxygenic organisms. Note that change in quinone did not occur in accordance with the origin of oxygenic photosynthesis, but an intermediary organisms, such as in the cyanobacterium Gloeobacter violaceus PCC 7421, would give an idea for the succession.
KeywordsAcaryochloris marina bacteriochlorophyll g chlorophyll a chlorophyll d Gloeobacter violaceus heliobacteria
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