文章基本信息

标题：The ancestral symbiont sensor kinase CSK links photosynthesis with gene expression in chloroplasts
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作者：Sujith Puthiyaveetil ; T. Anthony Kavanagh ; Peter Cain 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2008
卷号：105
期号：29
页码：10061-10066
DOI：10.1073/pnas.0803928105
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：We describe a novel, typically prokaryotic, sensor kinase in chloroplasts of green plants. The gene for this chloroplast sensor kinase (CSK) is found in cyanobacteria, prokaryotes from which chloroplasts evolved. The CSK gene has moved, during evolution, from the ancestral chloroplast to the nuclear genomes of eukaryotic algae and green plants. The CSK protein is now synthesised in the cytosol of photosynthetic eukaryotes and imported into their chloroplasts as a protein precursor. In the model higher plant Arabidopsis thaliana, CSK is autophosphorylated and required for control of transcription of chloroplast genes by the redox state of an electron carrier connecting photosystems I and II. CSK therefore provides a redox regulatory mechanism that couples photosynthesis to gene expression. This mechanism is inherited directly from the cyanobacterial ancestor of chloroplasts, is intrinsic to chloroplasts, and is targeted to chloroplast genes.
关键词：cell evolution ; chloroplast genome ; redox ; transcription ; two-component system