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Cyanobacteria in art. An unusual application of cyanobacteria. Culture of Nostoc sp. in " Cyanobacterial bonsai project " by Hidedo Iwasaki. Pictures of treated colonies were presented on exhibitions around Europe.
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Strong light can cause damage and be lethal for photosynthetic organisms. An increase of thermal dissipation of excess absorbed energy at the level of photosynthetic antenna is one of the processes protecting against deleterious effects of light. In cyanobacteria, a soluble photoactive carotenoid binding protein, Orange Carotenoid Protein (OCP) med...
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... tolerance to high heat was used for a long time to isolate cultures from natural sources ( Stanier et al., 1971). Cyanobacteria are exploited by man today (Figure 2) and perhaps will provide us with future energy supplies. As photoautotrophs, cyanobacteria are perfect candidates to become producers of biofuels. ...
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... reactive cations are stabilised under conditions in which electrons are not provided by Tyr Z and the Mn 4 Ca cluster. In these conditions the increased lifetime of P680 + can oxidise water or the -carotene of the D2 protein because it has a sufficiently high redox potential (1260 mV, (Rappaport et al., 2002)). The secondary electron pathway involving -carotene + and P680 + reduction has been largely discussed in the literature (for a review see " Scheme 1" in (Faller et al., 2001;Frank and Brudvig, 2004)). ...
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... in plants or green algae, induction of fluorescence quenching was not driven by ∆pH across the membrane (El Bissati et identified and initially characterised the Fluorescence Recovery Protein (FRP), which is responsible for regaining full antenna capacity after quenching. A Synechocystis mutant missing FRP was unable to regain full antenna capacity (Boulay The function of OCP was unknown when the first tri-dimensional crystal structure of the Arthrospira maxima OCP (Figure 12) was resolved at 2.1 Å ( Kerfeld et al., 2003;Kerfeld, 2004bKerfeld, , 2004a). Its function in photoprotection in Synechocystis was revealed in 2006 ( Wilson et al., 2006). ...
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... work of this thesis has contributed to the understanding of the OCP- related photoprotective mechanism, primarily by the development of an in vitro reconstitution system (Gwizdala et al., 2011). Figure 21 summarises the present model of the OCP-related mechanism we have developed based on Gwizdala, et al., 2011 and other projects I was involved during my thesis. ...
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Cyanobacteria have developed a photoprotective mechanism that decreases the energy arriving at the reaction centers by increasing thermal energy dissipation at the level of phycobilisome (PB), the extramembranous light harvesting antenna. This mechanism is triggered by the photoactive Orange Carotenoid Protein (OCP), which acts both as the photosen...
Photosynthesis requires a balance between efficient light harvesting and protection against photodamage. The cyanobacterial photoprotection system uniquely relies on the functioning of the photoactive orange carotenoid protein (OCP) that under intense illumination provides fluorescence quenching of the light-harvesting antenna complexes, phycobilis...
The Orange Carotenoid Protein (OCP) plays a similar photoprotective role in cyanobacterial photosynthesis to that of non-photochemical quenching in higher plants. Under high-light conditions OCP binds to the phycobilisome (PBS) and reduces energy transfer to photosystems. The protective cycle starts from a light-induced activation of OCP. Detailed...
The Orange Carotenoid Protein (OCP) is a unique photoreceptor crucial for cyanobacterial photoprotection. Best studied Synechocystis sp. PCC 6803 OCP belongs to the large OCP1 family. Downregulated by the Fluorescence Recovery Protein (FRP) in low-light, high-light-activated OCP1 binds to the phycobilisomes and performs non-photochemical quenching....
The two-domain photoactive Orange Carotenoid Protein (OCP) confers photoprotection in cyanobacteria and presumably stems from domain fusion. Yet, the primitive thylakoid-less cyanobacteria Gloeobacter encodes a complete OCP. Its photosynthesis regulation lacks the so-called Fluorescence Recovery Protein (FRP), which in Synechocystis inhibits OCP-me...
