The nature of the photosystem II reaction centre in the chlorophyll d-containing prokaryote, Acaryochloris marina
Identifieur interne : 001728 ( Istex/Checkpoint ); précédent : 001727; suivant : 001729The nature of the photosystem II reaction centre in the chlorophyll d-containing prokaryote, Acaryochloris marina
Auteurs : Min Chen [Australie] ; Alison Telfer [Royaume-Uni] ; Su Lin [États-Unis] ; Andrew Pascal [France] ; Anthony W. D. Larkum [Australie] ; James Barber [Royaume-Uni] ; Robert E. Blankenship [États-Unis]Source :
- Photochemical & Photobiological Sciences [ 1474-905X ] ; 2005.
English descriptors
- KwdEn :
- Absorption difference spectrum, Absorption spectra, Absorption spectrum, Acaryochloris, Acaryochloris marina, Acceptor, Centre, Chlorophyll, Crystal structure, Cytochrome, Dithionite, Enzymic oxygen trap, Essential component, Essential role, Febs lett, Intact cells, Light harvesting, Major pigment, Marina, Marina cells, Marina complexes, Maximum stoichiometry, Miyachi, Miyashita, Oxygen trap, Oxygenic, Oxygenic photosynthesis, Pheo, Pheophytin, Photosynthesis, Photosynthetic, Photosystem, Pigment composition, Pigment content, Pigment stoichiometry, Plant cell physiol, Primary donor, Primary electron, Primary electron acceptor, Primary electron donor, Primary photochemistry, Reaction center, Reaction centers, Reaction centre, Redox, Redox span, Room temperature, Sodium dithionite, Split water, State energy, Stoichiometry, Structural models, Synechocystis, Thylakoid, Thylakoid membranes, Trends biochem, Unsolubilized material, Uphill energy transfer, Water splitting reaction.
- Teeft :
- Absorption difference spectrum, Absorption spectra, Absorption spectrum, Acaryochloris, Acaryochloris marina, Acceptor, Centre, Chlorophyll, Crystal structure, Cytochrome, Dithionite, Enzymic oxygen trap, Essential component, Essential role, Febs lett, Intact cells, Light harvesting, Major pigment, Marina, Marina cells, Marina complexes, Maximum stoichiometry, Miyachi, Miyashita, Oxygen trap, Oxygenic, Oxygenic photosynthesis, Pheo, Pheophytin, Photosynthesis, Photosynthetic, Photosystem, Pigment composition, Pigment content, Pigment stoichiometry, Plant cell physiol, Primary donor, Primary electron, Primary electron acceptor, Primary electron donor, Primary photochemistry, Reaction center, Reaction centers, Reaction centre, Redox, Redox span, Room temperature, Sodium dithionite, Split water, State energy, Stoichiometry, Structural models, Synechocystis, Thylakoid, Thylakoid membranes, Trends biochem, Unsolubilized material, Uphill energy transfer, Water splitting reaction.
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.
Url:
DOI: 10.1039/b507057k
Affiliations:
- Australie, France, Royaume-Uni, États-Unis
- Angleterre, Grand Londres, Nouvelle-Galles du Sud
- Londres, Sydney
- Université de Sydney
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<front><div type="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.</div>
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