Abstract
Chl d is a major pigment in a novel oxygenic prokaryote Acaryochloris marina and functions as the primary electron donor P740 in PS I. The midpoint potential of P740 was reported to be +335 mV, which is significantly more negative than that of P700, and thus Chl d had been supposed to possess a lower oxidation potential than Chl a. Here, we report that the oxidation potential of Chl d was +0.88 V vs. SHE in acetonitrile, which was higher than that of Chl a (+0.81 V), and lower than that of Chl b (+0.94 V). The oxidation potential order, Chl b< Chl d < Chl a, can be explained by inductive effect of substituent groups on the conjugated p-electron system on the macrocycle. The results will help us to broaden our views on questions about photosystems in A. marina.
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References
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Ohashi, S. et al. (2008). Redox Potential of Chlorophyll d . In: Allen, J.F., Gantt, E., Golbeck, J.H., Osmond, B. (eds) Photosynthesis. Energy from the Sun. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-6709-9_24
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DOI: https://doi.org/10.1007/978-1-4020-6709-9_24
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