期刊文献+
共找到1篇文章
< 1 >
每页显示 20 50 100
Integration of Carbon Assimilation Modes with Photosynthetic Light Capture in the Green Alga Chlamydomonas reinhardtii
1
作者 Hanna Bergera Olga Blifernez-Klassen +3 位作者 Matteo Ballottari Roberto Bassi Lutz Wobbe Olaf Kruse 《Molecular Plant》 SCIE CAS CSCD 2014年第10期1545-1559,共15页
The unicellular green alga Chlamydomonas reinhardtii is capable of using organic and inorganic carbon sources simultaneously, which requires the adjustment of photosynthetic activity to the prevailing mode of carbon a... The unicellular green alga Chlamydomonas reinhardtii is capable of using organic and inorganic carbon sources simultaneously, which requires the adjustment of photosynthetic activity to the prevailing mode of carbon assimilation. We obtained novel insights into the regulation of light-harvesting at photosystem II (PSII) following altered carbon source avail- ability. In C. reinhardtii, synthesis of PSll-associated light-harvesting proteins (LHCBMs) is controlled by the cytosolic RNA- binding protein NAB1, which represses translation of particular LHCBM isoform transcripts. This mechanism is fine-tuned via regulation of the nuclear NAB1 promoter, which is activated when linear photosynthetic electron flow is restricted by CO2- limitation in a photoheterotrophic context. In the wild-type, accumulation of NAB1 reduces the functional PSII antenna size, thus preventing a harmful overexcited state of PSII, as observed in a NABl-less mutant. We further demonstrate that trans- lation control as a newly identified long-term response to prolonged CO2-1imitation replaces LHCII state transitions as a fast response to PSII over-excitation. Intriguingly, activation of the long-term response is perturbed in state transition mutant stt7, suggesting a regulatory link between the long- and short-term response. We depict a regulatory circuit operating on distinct timescales and in different cellular compartments to fine-tune light-harvesting in photoheterotrophic eukaryotes. 展开更多
关键词 light-harvesting antenna translation control state transitions NAB1 carbon metabolism chlamydomonasreinhardtii.
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部