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Revisiting cyanobacterial state transitions.
Photochemical & Photobiological Sciences ( IF 2.7 ) Pub Date : 2020-03-12 , DOI: 10.1039/c9pp00451c
Pablo I Calzadilla 1 , Diana Kirilovsky 1
Affiliation  

Photosynthetic organisms are exposed to a fluctuating environment in which light intensity and quality change continuously. Specific illumination of either photosystem (PSI or PSII) creates an energy imbalance, leading to the reduction or oxidation of the intersystem electron transport chain. This redox imbalance could trigger the formation of dangerous reactive oxygen species. Cyanobacteria, like plants and algae, have developed a mechanism to re-balance this preferential excitation of either reaction center, called state transitions. State transitions are triggered by changes in the redox state of the membrane-soluble plastoquinone (PQ) pool. In plants and green algae, these changes in redox potential are sensed by Cytochrome b6f, which interacts with a specific kinase that triggers the movement of the main PSII antenna (the light-harvesting complex II). By contrast, although cyanobacterial state transitions have been studied extensively, there is still no agreement about the molecular mechanism, the PQ redox state sensor and the signaling pathways involved. In this review, we aimed to critically evaluate the results published on cyanobacterial state transitions, and discuss the "new" and "old" models in the subject. The phycobilisome and membrane contributions to this physiological process were addressed and the current hypotheses regarding its signaling transduction pathway were discussed.

中文翻译:

回顾蓝细菌状态转换。

光合生物暴露于变化的环境中,在该环境中光强度和质量不断变化。任一光系统(PSI或PSII)的特定照明都会造成能量不平衡,从而导致系统间电子传输链的还原或氧化。这种氧化还原失衡可能引发危险的活性氧物种的形成。蓝细菌像植物和藻类一样,已经开发出一种机制来重新平衡任一反应中心的这种优先激发,称为状态转换。膜溶性质体醌(PQ)库的氧化还原状态发生变化,从而触发状态转换。在植物和绿藻中,细胞色素b6f可以感知氧化还原电位的这些变化,它与触发主要PSII天线(光捕获复合体II)运动的特定激酶相互作用。相比之下,尽管对蓝细菌状态转换进行了广泛的研究,但是关于分子机制,PQ氧化还原状态传感器和涉及的信号传导途径仍未达成共识。在这篇评论中,我们旨在批判性评估发表在蓝细菌状态转变上的结果,并讨论该主题中的“新”和“旧”模型。讨论了藻胆体和膜对该生理过程的贡献,并讨论了有关其信号转导途径的当前假说。PQ氧化还原状态传感器及其涉及的信号通路。在这篇评论中,我们旨在批判性评估发表在蓝细菌状态转变上的结果,并讨论该主题中的“新”和“旧”模型。解决了藻胆体和膜对该生理过程的贡献,并讨论了有关其信号转导途径的当前假说。PQ氧化还原状态传感器及其涉及的信号通路。在这篇评论中,我们旨在批判性评估发表在蓝细菌状态转变上的结果,并讨论该主题中的“新”和“旧”模型。解决了藻胆体和膜对该生理过程的贡献,并讨论了有关其信号转导途径的当前假说。
更新日期:2020-03-12
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