Abstract
Pigment-protein complexes enriched in photosystem II (PS II) have been isolated from the chlorophyll (Chl) d containing cyanobacterium, Acaryochloris marina. A small PS II-enriched particle, we call ‘crude reaction centre’, contained 20 Chl d, 0.5 Chl a and 1 redox active cytochrome b-559 per 2 pheophytin a, plus the D1 and D2 proteins. A larger PS II-enriched particle, we call ‘core’, additionally bound the antenna complexes, CP47 and CP43, and had a higher chlorophyll per pheophytin ratio. Pheophytin a could be photoreduced in the presence of a strong reductant, indicating that it is the primary electron acceptor in photosystem II of A. marina. A substoichiometric amount of Chl a (less than one chlorophyll a per 2 pheophytin a) strongly suggests that Chl a does not have an essential role in the photochemistry of PS II in this organism. We conclude that PS II, in A. marina, utilizes Chl d and not Chl a as primary electron donor and that the primary electron acceptor is one of two molecules of pheophytin a.
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Abbreviations
- BChl:
-
Bacteriochlorophyll
- BRC:
-
purple bacterial RC
- Chl:
-
chlorophyll
- cyt:
-
cytochrome
- P:
-
primary electron donor
- Pheo:
-
pheophytin
- PS I and PS II:
-
photosystems I and II
- QA:
-
secondary plastoquinone electron acceptor in PS II
- RC:
-
reaction centre of photosystem II
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Dedicated to Professor James Barber on the occasion of his 65th birthday.
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Chen, M., Telfer, A., Lin, S. et al. The nature of the photosystem II reaction centre in the chlorophyll d-containing prokaryote, Acaryochloris marina. Photochem Photobiol Sci 4, 1060–1064 (2005). https://doi.org/10.1039/b507057k
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DOI: https://doi.org/10.1039/b507057k