2010
DOI: 10.1007/s11120-010-9530-3
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An overview on chlorophylls and quinones in the photosystem I-type reaction centers

Abstract: Minor but key chlorophylls (Chls) and quinones in photosystem (PS) I-type reaction centers (RCs) are overviewed in regard to their molecular structures. In the PS I-type RCs, the prime-type chlorophylls, namely, bacteriochlorophyll (BChl) a' in green sulfur bacteria, BChl g' in heliobacteria, Chl a' in Chl a-type PS I, and Chl d' in Chl d-type PS I, function as the special pairs, either as homodimers, (BChl a')(2) and (BChl g')(2) in anoxygenic organisms, or heterodimers, Chl a/a' and Chl d/d' in oxygenic phot… Show more

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Cited by 34 publications
(17 citation statements)
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“…Furthermore, as only trace ammonium is available within the culture medium, the energy-intensive reductions of nitrate or dinitrogen are the only processes by which the community can assimilate nitrogen. It is likely that many of our heterotrophic consorts lack the ability to assimilate nitrate into biomass, but most cyanobacteria perform this function (Ohashi et al, 2010; Luque-Almagro et al, 2011). Therefore, it is probable that the cyanobacteria in our consortia also serve as the major entry point for reduced nitrogen species into the community early in the growth period, as they are unlikely to be energy-limited under the continuous light regime.…”
Section: Discussionmentioning
confidence: 99%
“…Furthermore, as only trace ammonium is available within the culture medium, the energy-intensive reductions of nitrate or dinitrogen are the only processes by which the community can assimilate nitrogen. It is likely that many of our heterotrophic consorts lack the ability to assimilate nitrate into biomass, but most cyanobacteria perform this function (Ohashi et al, 2010; Luque-Almagro et al, 2011). Therefore, it is probable that the cyanobacteria in our consortia also serve as the major entry point for reduced nitrogen species into the community early in the growth period, as they are unlikely to be energy-limited under the continuous light regime.…”
Section: Discussionmentioning
confidence: 99%
“…As described above, the photochemical reaction centre of both photosystems is composed of 6 chlorine pigments: in the case of PSI, these are six Chls a , one of which is 13’ epimer [17, 18, 234], whereas in PSII four are Chls a and two are Pheo (Fig. 1C ).…”
Section: Energy Transfer and Photochemistrymentioning
confidence: 95%
“…Semiquinones are typical organic radical anions being the intermediate form in the redox equilibrium between quinones and hydroquinones. These radicals are present in all life forms as they act as electron-transfer agents in the mitochondrial respiratory chain and in the reaction centers of bacterial and plant photosynthesis [3,4]. Moreover, o-semiquinones are known to possess chelating ability toward metal ions [5][6][7], which is particularly important for the activation of electron transfer through interaction with cations acting as Lewis acids [5,8].…”
Section: Introductionmentioning
confidence: 99%