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首页> 外文期刊>Journal of Experimental Botany >Multisignal control of expression of the LHCX protein family in the marine diatom Phaeodactylum tricornutum
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Multisignal control of expression of the LHCX protein family in the marine diatom Phaeodactylum tricornutum

机译：海洋硅藻Phaeodactylum tricornutum中LHCX蛋白家族表达的多信号控制

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摘要

Multiple stress signalling pathways regulate LHCX family gene expression in the diatom Phaeodactylum tricornutum to attune acclimation responses efficiently in highly variable ocean environments.Diatoms are phytoplanktonic organisms that grow successfully in the ocean where light conditions are highly variable. Studies of the molecular mechanisms of light acclimation in the marine diatom Phaeodactylum tricornutum show that carotenoid de-epoxidation enzymes and LHCX1, a member of the light-harvesting protein family, both contribute to dissipate excess light energy through non-photochemical quenching (NPQ). In this study, we investigate the role of the other members of the LHCX family in diatom stress responses. Our analysis of available genomic data shows that the presence of multiple LHCX genes is a conserved feature of diatom species living in different ecological niches. Moreover, an analysis of the levels of four P. tricornutum LHCX transcripts in relation to protein expression and photosynthetic activity indicates that LHCXs are differentially regulated under different light intensities and nutrient starvation, mostly modulating NPQ capacity. We conclude that multiple abiotic stress signals converge to regulate the LHCX content of cells, providing a way to fine-tune light harvesting and photoprotection. Moreover, our data indicate that the expansion of the LHCX gene family reflects functional diversification of its members which could benefit cells responding to highly variable ocean environments.
机译：多种胁迫信号传导途径调节着三角藻硅藻中LHCX家族基因的表达，从而有效地调节了高度变化的海洋环境中的驯化响应。硅藻是在光照条件高度变化的海洋中成功生长的浮游植物。对海洋硅藻三角藻（Phaeodactylum tricornutum）中光适应的分子机制的研究表明，类胡萝卜素脱环氧化酶和LHCX1（光收集蛋白家族的成员）两者均通过非光化学猝灭（NPQ）来消除多余的光能。在这项研究中，我们调查LHCX家族的其他成员在硅藻应力反应中的作用。我们对可用基因组数据的分析表明，多个LHCX基因的存在是生活在不同生态位中的硅藻物种的保守特征。此外，对与蛋白质表达和光合作用相关的四个三角假单胞菌LHCX转录物水平的分析表明，LHCXs在不同的光强度和营养饥饿状态下受到差异调节，主要调节NPQ的能力。我们得出的结论是，多个非生物胁迫信号会聚在一起以调节细胞的LHCX含量，从而提供一种微调光收集和光保护的方法。此外，我们的数据表明，LHCX基因家族的扩展反映了其成员的功能多样化，这可能有益于应对高度变化的海洋环境的细胞。

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