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slr0151 in synechocystis sp. PCC 6803 is required for efficient repair of photosystem Ⅱ under high-light condition

Journal of Integrative Plant Biology 2014年第12期56卷 1136-1150页

作者： Haomeng Yang Libing Liao Tingting Bo Lei Zhao Xuwu Sun Xuefeng Lu Birgitta Norling Fang Huang Key Laboratory of Photobiology Institute of Botany the Chinese Academy of Sciences University of the Chinese Academy of Sciences Qingdao Institute of Bioenergy and Bioprocess Technology the Chinese Academy of Sciences School of Biological Sciences Nanyang Technological University

cyanobacteria are ancient photosynthetic prokareyotes that have adapted successfully to adverse environments including high-light irradiation. Although it is known that the repair of photodamaged photosystem Ⅱ（PSⅡ） in the organisms is a highly regulated process, our knowledge of the molecular components that regulate each step of the process is *** have previously identified a hypothetical protein slr0151 in the membrane fractions of cyanobacterium synechocystis *** 6803. Here, we report that slr0151 is involved in PSⅡ repair of the organism. We generated a mutant strain（Dslr0151）lacking the protein slr0151 and analyzed its characteristics under normal and high-light conditions. Targeted deletion of slr0151 resulted in decreased PSⅡ activity in synechocystis. Moreover,the mutant exhibited increased photoinhibition due to impairment of PSⅡ repair under high-light condition. Further analysis using in vivo radioactive labeling and 2-D blue native/sodium dodecylsulfate polyacrylamide gel electrophoresis indicated that the PSⅡ repair cycle was hindered at the levels of D1 synthesis and disassembly and/or assembly of PSⅡ in the mutant. protein interaction assays demonstrated that slr0151 interacts with D1 and CP43 proteins. Taken together,these results indicate that slr0151 plays an important role in regulating PSⅡ repair in the organism under high-light stress condition.

关键词： cyanobacteria membrane protein photosystem ⅱ repair slr0151 synechocystis

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