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Credit: Nikolai Sluchanko Exposure to light is compulsory for photosynthetic organisms for the conversion of inorganic compounds into organic ones. However, if there is too much solar energy, the photosystems and other cell components could be damaged. Thanks to special protective proteins, the overexcitation is converted into heat - in the process called non-photochemical quenching. The object of the published study, OCP, was one of such defenders. It was first isolated in 1981 from representatives of the ancient group of photosynthetic bacteria, ?yanobacteria. OCP comprises two domains forming a cavity, in which a carotenoid pigment is embedded. When light is absorbed by the carotenoid molecule, OCP can change from an inactive orange to an active red form. This process is multi-stage and follows a complex hierarchy of events. We showed the asynchrony of these changes in previous work, but the mechanism of the very first stage of OCP activation, associated with the breakage of hy

Czech republicSankt peterburgIrkutskaya oblastEugene maksimovNikolai sluchankoRussian academy of sciencesSemenov federal research centerMoscow institute of physicsResearch centre for biotechnologyResearcher of the federal research centerYua ovchinnikov institute of bioorganic chemistrySenior researcherFederal research centreRussian academyLeading researcherFederal research center