Research of the novelty and universal mechanism of photosystem II by the chlorophyll d having cyanobacteria

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A. marina is a photosynthetic cyanobacterium in which chlorophyll(Chl) d is the major antenna pigment. Chl d absorbs light with a wavelength up to 30 nm red-shifted from Chl a. Therefore, if Chl d was the special pair component, the overall energetics must be different in A. marina. We performed direct measurements of the redox potential of primary and secondary electron donor using purified Acaryochloris PS II and the Chl a-type PS II. We obtained positive potential shits for A. marina in PS II complexes. The difference in the redox potential of electron donors between the two species closely corresponded to the difference in the light energy absorbed by Chl a versus Chl d. These finding indicate that changes in Chl species modulates a specific potential change in reduction side in PS II.