光系统ⅡD1蛋白表达调控机制研究进展  

The Progress of Researches on Regulatory Mechanism of Photosystem Ⅱ D1 Protein Expression

作　　者：朱素琴[1] 夏树林[1] 陈庆[1] 陈曦[1] 季本华[1] 

机构地区：[1]南通大学生命科学学院,江苏南通226007

出　　处：《贵州农业科学》2012年第11期37-42,共6页Guizhou Agricultural Sciences

基　　金：国家自然科学基金项目"杂交稻生育后期的低温敏感性和光合膜组分的关系"(30270794);江苏省自然科学基金项目"叶绿体G3PAT酶酰基选择性与杂交稻生育后期低温敏感性的关系(BK2007063)";"G3PAT基因与水稻类囊体膜脂不饱和度的遗传控制"(BK2005041)

摘　　要：强光下植物光系统Ⅱ(PSⅡ)易于失活,D1蛋白是PSⅡ受到伤害的原初部位,导致psbA基因编码的D1蛋白降解,同时在多步PSⅡ修复循环中D1蛋白重新合成。衣藻(Chlamydomonas reinhardtii)psbA基因的表达在mRNA加工过程、翻译起始水平上受到严格调控。光通过激活结合在psbA基因mR-NA5’非翻译区(5’-UTR)上的蛋白复合体(RNA-结合蛋白,RBP)而促进翻译,该蛋白质复合体含有氧化还原激活的调节位点。对PSⅡD1蛋白的转化过程、psbA基因转录及翻译进行分析,综述了光系统Ⅱ蛋白表达调节机制的研究进展。The photosystem（PS） II of higher plants is prone to light-induced inactivation,the D1 protein being the primary target of such damage.As a consequence,the D1 protein,encoded by the psbA gene,is degraded and re-synthesized in a multistep process called PSII repair cycle.In chloroplasts of Chlamydomonas reinhardtii the psbA gene expression was strongly regulated by mRNA processing,and particularly at the level of translation initiation.Light was proposed to stimulate the translation of chloroplast psbA mRNA by activating a protein complex associated with the 5＇ untranslated region of this mRNA（RNA-binding protein,RBP）.The protein complex contains a redox-active regulatory site responsive to thioredoxin.The author summarized the turnover of the photosystem II D1 protein and the progress of researches on regulatory mechanism of photosystem II D1 protein expression at the levels of transcription,translation.

关 键 词：PSⅡ-D1蛋白 PSBA基因 氧化还原 RNA结合(RB)蛋白 调控机制 光系统 

分 类 号：Q946.5[生物学—植物学]