Photoinhibition of photosystem II under environmental stress
Photoinhibition of photosystem II under environmental stress
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DOI：
10.1016/j.bbabio.2006.11.019
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发表时间：
2007-06-01
影响因子：
4.3
通讯作者：
Allakhverdiev, Suleyman I.
中科院分区：
文献类型：
--
作者：
Murata, Norio;Takahashi, Shunichi;Allakhverdiev, Suleyman I.
在强光下抑制光系统II（PSII）的活性被称为光抑制。这种现象是由于PSII的光损伤率和受损PSII的修复率之间的不平衡。在经典的光抑制机制中，强光诱导活性氧（ROS）的产生，直接破坏PSII的光化学反应中心。相比之下，在一个新的方案中，我们提出，光损伤是由光的直接影响的氧的演变复杂和ROS抑制修复光损伤的PSII抑制主要是蛋白质从头合成。PSII的活性受到多种环境胁迫的限制。环境胁迫对PSII的损伤和修复的影响可以单独研究，并且似乎环境胁迫，除强光外，主要通过抑制PSII的修复来起作用。研究表明，修复抑制应力包括CO2限制，适度的热，高浓度的NaCl和低温，其中每一个抑制蛋白质的从头合成，这是修复PSII所需的。我们假设，大多数类型的环境压力抑制固定CO2与由此产生的ROS，这反过来又抑制蛋白质合成。(c)2006 Elsevier B.V.保留所有权利。
Inhibition of the activity of photosystem II (PSII) under strong light is referred to as photoinhibition. This phenomenon is due to an imbalance between the rate of photodamage to PSII and the rate of the repair of damaged PSII. In the "classical" scheme for the mechanism of photo inhibition, strong light induces the production of reactive oxygen species (ROS), which directly inactivate the photochemical reaction center of PSII. By contrast, in a new scheme, we propose that photodamage is initiated by the direct effect of light on the oxygen-evolving complex and that ROS inhibit the repair of photodamaged PSII by suppressing primarily the synthesis of proteins de novo. The activity of PSII is restricted by a variety of environmental stresses. The effects of environmental stress on damage to and repair of PSII can be examined separately and it appears that environmental stresses, with the exception of strong light, act primarily by inhibiting the repair of PSII. Studies have demonstrated that repair-inhibitory stresses include CO2 limitation, moderate heat, high concentrations of NaCl, and low temperature, each of which suppresses the synthesis of proteins de novo, which is required for the repair of PSII. We postulate that most types of environmental stress inhibit the fixation of CO2 with the resultant generation of ROS, which, in turn, inhibit protein synthesis. (c) 2006 Elsevier B.V. All rights reserved.