Specific degradation of photosystem Ⅱ D1 protein by a protease (Alr3815) in heterocysts of the cyanobacterium Anabaena sp.PCC7120  

作　　者：YANG GuoHua HU Bin ZHAO JinDong 

机构地区：[1]State Key Laboratory of Protein and Plant Genetic Engineering, College of Life Sciences, Peking University, Beijing 100871, China [2]Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China

出　　处：《Chinese Science Bulletin》2011年第11期1068-1070,共3页

基　　金：supported by the National Natural Sciences Foundation of China(30230040)

摘　　要：Some filamentous cyanobacteria form heterocysts under conditions lacking combined nitrogen for nitrogen fixation.Photosystem II is removed from heterocyst during the process of cell differentiation.Here,we demonstrate that Alr3815 is a protease that is capable of degrading D1 protein of photosystem II.Strain-322,which lacks alr3815,is impaired in nitrogen fixation in air because some oxygen evolving activity is retained in its heterocysts.Our results also suggest that calcium may play a regulatory role in D1 degradation during heterocyst differentiation.Some filamentous cyanobacteria form heterocysts under conditions lacking combined nitrogen for nitrogen fixation. Photosystem II is removed from heterocyst during the process of cell differentiation. Here, we demonstrate that Alr3815 is a protease that is capable of degrading D1 protein of photosystem II. Strain-322, which lacks alr3815, is impaired in nitrogen fixation in air be- cause some oxygen evolving activity is retained in its heterocysts. Our results also suggest that calcium may play a regulatory role in D 1 degradation during heterocyst differentiation.

关 键 词：丝状固氮蓝藻 光系统II 异形胞 蛋白酶 降解 D1蛋白 鱼腥藻 分化过程 

分 类 号：Q949.225[生物学—植物学] Q945.11