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题名: Dynamic Changes of IsiA-Containing Complexes during Long-Term Iron Deficiency in Synechocystis sp PCC 6803
作者: Ma, Fei1, 2; Zhang, Xin1, 2; Zhu, Xi1, 2; Li, Tianpei1, 2; Zhan, Jiao1; Chen, Hui1; He, Chenliu1; Wang, Qiang1
关键词: iron deficiency ; IsiA-containing complexes ; IsiA-PS I high fluorescence supercomplex ; IsiA-PS I low fluorescence supercomplex ; Synechocystis sp PCC 6803
刊名: MOLECULAR PLANT
发表日期: 2017-01-09
DOI: 10.1016/j.molp.2016.10.009
卷: 10, 期:1, 页:143-154
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
类目[WOS]: Biochemistry & Molecular Biology ; Plant Sciences
研究领域[WOS]: Biochemistry & Molecular Biology ; Plant Sciences
英文摘要: Iron stress-induced protein A (IsiA), a major chlorophyll-binding protein in the thylakoid membrane, is significantly induced under iron deficiency conditions. Using immunoblot analysis and 77 K fluorescence spectroscopy combined with sucrose gradient fractionation, we monitored dynamic changes of IsiA-containing complexes in Synechocystis sp. PCC 6803 during exposure to long-term iron deficiency. Within 3 days of exposure to iron deficiency conditions, the initially induced free IsiA proteins preferentially conjugated to PS I trimer to form IsiA(18)-PS I trimers, which serve as light energy collectors for efficiently transmitting energy to PS I. With prolonged iron deficiency, IsiA proteins assembled either into IsiA aggregates or into two other types of IsiA-PS I supercomplexes, namely IsiA-PS I high fluorescence supercomplex (IHFS) and IsiA-PS I low fluorescence supercomplex (ILFS). Further analysis revealed a role for IsiA as an energy dissipater in the IHFS and as an energy collector in the ILFS. The trimeric structure of PS I mediated by PsaL was found to be indispensable for the formation of IHFS/ILFS. Dynamic changes in IsiA-containing complexes in cyanobacteria during long-term iron deficiency may represent an adaptation to iron limitation stress for flexible light energy distribution, which balances electron transfer between PS I and PS II, thus minimizing photooxidative damage.
关键词[WOS]: CHLOROPHYLL-BINDING-PROTEIN ; PHOTOSYNTHETIC ELECTRON-TRANSPORT ; SYNECHOCOCCUS SP PCC-7942 ; ABSORPTION CROSS-SECTION ; TRIMERIC PHOTOSYSTEM-I ; SP STRAIN PCC-6803 ; HIGH LIGHT ; ENERGY-DISSIPATION ; ANACYSTIS-NIDULANS ; OXIDATIVE STRESS
语种: 英语
项目资助者: National Program on Key Basic Research Project(2012CB224803) ; State Key Laboratory of Freshwater Ecology and Biotechnology(2016FB11) ; National Natural Science Foundation of China(31270094 ; 31300030)
WOS记录号: WOS:000396358200012
ISSN号: 1674-2052
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内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/28969
Appears in Collections:藻类生物学及应用研究中心_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Hydrobiol, Key Lab Algal Biol, Wuhan 430072, Hubei, Peoples R China
2.Univ Chinese Acad Sci, Coll Life Sci, Beijing 100039, Peoples R China
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