An overview on chlorophylls and quinones in the photosystem I-type reaction centers

Ohashi, Shunsuke; Iemura, Tatsuya; Okada, Naoki; Itoh, Shintaro; Furukawa, Hayato; Okuda, Masaaki; Ohnishi‐Kameyama, Mayumi; Ogawa, Taiji; Miyashita, Hideaki; Watanabe, Tadashi; Itoh, Shigeru; Oh‐oka, Hirozo; Inoue, Kazuhito; Kobayashi, Masami

doi:10.1007/s11120-010-9530-3

Cited by 34 publications

(17 citation statements)

References 111 publications

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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%

Phototrophic biofilm assembly in microbial-mat-derived unicyanobacterial consortia: model systems for the study of autotroph-heterotroph interactions

et al. 2014

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Microbial autotroph-heterotroph interactions influence biogeochemical cycles on a global scale, but the diversity and complexity of natural systems and their intractability to in situ manipulation make it challenging to elucidate the principles governing these interactions. The study of assembling phototrophic biofilm communities provides a robust means to identify such interactions and evaluate their contributions to the recruitment and maintenance of phylogenetic and functional diversity over time. To examine primary succession in phototrophic communities, we isolated two unicyanobacterial consortia from the microbial mat in Hot Lake, Washington, characterizing the membership and metabolic function of each consortium. We then analyzed the spatial structures and quantified the community compositions of their assembling biofilms. The consortia retained the same suite of heterotrophic species, identified as abundant members of the mat and assigned to Alphaproteobacteria, Gammaproteobacteria, and Bacteroidetes. Autotroph growth rates dominated early in assembly, yielding to increasing heterotroph growth rates late in succession. The two consortia exhibited similar assembly patterns, with increasing relative abundances of members from Bacteroidetes and Alphaproteobacteria concurrent with decreasing relative abundances of those from Gammaproteobacteria. Despite these similarities at higher taxonomic levels, the relative abundances of individual heterotrophic species were substantially different in the developing consortial biofilms. This suggests that, although similar niches are created by the cyanobacterial metabolisms, the resulting webs of autotroph-heterotroph and heterotroph-heterotroph interactions are specific to each primary producer. The relative simplicity and tractability of the Hot Lake unicyanobacterial consortia make them useful model systems for deciphering interspecies interactions and assembly principles relevant to natural microbial communities.

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Section: Discussionmentioning

confidence: 99%

Phototrophic biofilm assembly in microbial-mat-derived unicyanobacterial consortia: model systems for the study of autotroph-heterotroph interactions

et al. 2014

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“…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%

A Comparison Between Plant Photosystem I and Photosystem II Architecture and Functioning

Caffarri

Tibiletti²,

Jennings³

et al. 2014

CPPS

216

162

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Oxygenic photosynthesis is indispensable both for the development and maintenance of life on earth by converting light energy into chemical energy and by producing molecular oxygen and consuming carbon dioxide. This latter process has been responsible for reducing the CO2 from its very high levels in the primitive atmosphere to the present low levels and thus reducing global temperatures to levels conducive to the development of life. Photosystem I and photosystem II are the two multi-protein complexes that contain the pigments necessary to harvest photons and use light energy to catalyse the primary photosynthetic endergonic reactions producing high energy compounds. Both photosystems are highly organised membrane supercomplexes composed of a core complex, containing the reaction centre where electron transport is initiated, and of a peripheral antenna system, which is important for light harvesting and photosynthetic activity regulation. If on the one hand both the chemical reactions catalysed by the two photosystems and their detailed structure are different, on the other hand they share many similarities. In this review we discuss and compare various aspects of the organisation, functioning and regulation of plant photosystems by comparing them for similarities and differences as obtained by structural, biochemical and spectroscopic investigations.

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“…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%

DFT insight into o-semiquinone radicals and Ca2+ ion interaction: structure, g tensor, and stability

Witwicki

Jezierska

2013

Theor Chem Acc

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Density functional theory methods were employed to elucidate the interactions between calcium ions and various o-semiquinone radicals mimicking the interactions occurring in biochemical systems. Predicted changes in the molecular and electronic structures of the radicals on Ca 2? coordination were correlated with the changes of g tensor and compared with those exerted by Mg 2? ions (reported by us previously). In order to broaden the insight into the differences between the Mg 2? and Ca 2?complexes, their relative stability was estimated on the basis of theoretically predicted Gibbs energies for the process of the complex formation.

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An overview on chlorophylls and quinones in the photosystem I-type reaction centers

Cited by 34 publications

References 111 publications

Phototrophic biofilm assembly in microbial-mat-derived unicyanobacterial consortia: model systems for the study of autotroph-heterotroph interactions

Phototrophic biofilm assembly in microbial-mat-derived unicyanobacterial consortia: model systems for the study of autotroph-heterotroph interactions

A Comparison Between Plant Photosystem I and Photosystem II Architecture and Functioning

DFT insight into o-semiquinone radicals and Ca2+ ion interaction: structure, g tensor, and stability

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