The Low Molecular Weight Protein PsaI Stabilizes the Light-Harvesting Complex II Docking Site of Photosystem I1

The Low Molecular Weight Protein PsaI Stabilizes the Light-Harvesting Complex II Docking Site of Photosystem I1
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低分子量蛋白 PsaI 稳定光系统 I1 的光捕获复合物 II 对接位点

DOI:
10.1104/pp.16.00647
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发表时间:
2016
期刊:
影响因子:
7.4
通讯作者:
Meurer J
Meurer J
中科院分区:
生物学1区
文献类型:
--
作者:
Plöchinger M;Torabi S;Rantala M;Tikkanen M;Suorsa M;Jensen PE;Aro EM;Meurer J

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PsaI是PSI的三种低分子量肽之一。烟草可塑蛋白dpsaigene的靶向失活对PSI周围的光合电子传递或参与光合作用的蛋白质积累没有可测量的影响。相反,缺乏PsaI会破坏PsaL和PsaH与PSI的结合,两者都形成了PSI的光收集复合物(LHC)II对接位点。令人惊讶的是,LHCII结合位点的这些改变并没有阻止状态转变,而是导致PSI-LHCII复合物的发生率增加,这与正常生长光照条件下LHCII磷酸化水平升高相一致。值得注意的是,即使在远红光照射后,在ƊpsaIin黑暗中LHCII也会迅速磷酸化。我们发现这种暗磷酸化也发生在先前描述的PSI功能或状态转变受损的突变体中。在黑暗中,质体醌(PQ)池迅速转变为更还原的氧化还原状态,导致ƊpsaI中LHCII磷酸化增强。由于PQ池的氧化还原状态在功能上与一系列生理、生化和基因表达反应有关,我们提出突变植物在黑暗中进入状态2的转变代表了一种代偿和/或保护性代谢机制。这涉及到PQ池的增加还原和/或减少氧化,大概是为了在光开始时维持两个光系统的平衡激发。
PsaI represents one of three low molecular weight peptides of PSI. Targeted inactivation of the plastidPsaIgene inNicotiana tabacumhas no measurable effect on photosynthetic electron transport around PSI or on accumulation of proteins involved in photosynthesis. Instead, the lack of PsaI destabilizes the association of PsaL and PsaH to PSI, both forming the light-harvesting complex (LHC)II docking site of PSI. These alterations at the LHCII binding site surprisingly did not prevent state transition but led to an increased incidence of PSI-LHCII complexes, coinciding with an elevated phosphorylation level of the LHCII under normal growth light conditions. Remarkably, LHCII was rapidly phosphorylated in ƊpsaIin darkness even after illumination with far-red light. We found that this dark phosphorylation also occurs in previously described mutants impaired in PSI function or state transition. A prompt shift of the plastoquinone (PQ) pool into a more reduced redox state in the dark caused an enhanced LHCII phosphorylation in ƊpsaI. Since the redox status of the PQ pool is functionally connected to a series of physiological, biochemical, and gene expression reactions, we propose that the shift of mutant plants into state 2 in darkness represents a compensatory and/or protective metabolic mechanism. This involves an increased reduction and/or reduced oxidation of the PQ pool, presumably to sustain a balanced excitation of both photosystems upon the onset of light.
优化波动光下的光合作用
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