Clémence Boulay

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High light can be lethal for photosynthetic organisms. Similar to plants, most cyanobacteria protect themselves from high irradiance by increasing thermal dissipation of excess absorbed energy. The photoactive soluble orange carotenoid protein (OCP) is essential for the triggering of this photoprotective mechanism. Light induces structural changes in the(More)
Excess light is harmful for photosynthetic organisms. The cyanobacterium Synechocystis PCC 6803 protects itself by dissipating the excess of energy absorbed by the phycobilisome, the water-soluble antenna of Photosystem II, into heat decreasing the excess energy arriving to the reaction centers. Energy dissipation results in a detectable decrease of(More)
In response to iron deficiency, cyanobacteria synthesize the iron stress-induced chlorophyll binding protein IsiA. This protein protects cyanobacterial cells against iron stress. It has been proposed that the protective role of IsiA is related to a blue light-induced nonphotochemical fluorescence quenching (NPQ) mechanism. In iron-replete cyanobacterial(More)
Cyanobacteria have developed a photoprotective mechanism that decreases the energy arriving at the photosynthetic reaction centers under high-light conditions. The photoactive orange carotenoid protein (OCP) is essential in this mechanism as a light sensor and energy quencher. When OCP is photoactivated by strong blue-green light, it is able to dissipate(More)
Cysteine protease activities have been characterized with benzyloxycarbonyl-lysinep-nitrophenyl ester as a synthetic substrate and E64 as a specific inhibitor in the hepatopancreas of the shrimpPenaeus vannamei. An optimum pH of 5.1 has been measured. To characterize these cysteine proteases, a hepatopancreas cDNA library was screened by hybridization to a(More)
In gram-negative bacteria, like Rhodobacter capsulatus, about 10 membrane-bound components (CcmABCDEFGHI and CcdA) are required for periplasmic maturation of c-type cytochromes. These components perform the chaperoning and thio-oxidoreduction of the apoproteins as well as the delivery and ligation of the heme cofactors. In the absence of any of these(More)
Arezki Sedoud,a,b,c,1 Rocío López-Igual,a,b,1,2 Ateeq ur Rehman,d Adjélé Wilson,a,b François Perreau,e Clémence Boulay,c Imre Vass,d Anja Krieger-Liszkay,a,b and Diana Kirilovskya,b,3 a Commissariat à l’Energie Atomique, Institut de Biologie et Technologies de Saclay, 91191 Gif sur Yvette, France bCNRS, Unité Mixte de Recherche 8221, 91191 Gif sur Yvette,(More)
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