Electron transport and light-harvesting switches in cyanobacteria.

Electron transport and light-harvesting switches in cyanobacteria.
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DOI:
10.3389/fpls.2014.00007
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发表时间:
2014
影响因子:
5.6
通讯作者:
Mullineaux CW
Mullineaux CW
中科院分区:
生物学2区
文献类型:
--
作者:
Mullineaux CW

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蓝藻具有多种机制来调节光合和呼吸电子传递途径。电子传递可以通过控制来自捕光复合物的激发能的转移来间接调节,或者可以通过控制光合和呼吸电子传递复合物的化学计量、定位和相互作用来更直接地调节。线性电子传递与循环电子传递的程度的调节对于控制电池的氧化还原平衡特别重要。这篇评论讨论了什么是已知的监管机制和它们发生的时间尺度上,特别是关于所需的结构重组和拥挤的类囊体膜中的膜整合蛋白的有限流动性所施加的限制。转换机制需要大量的整体类囊体膜蛋白的运动发生在较低的时间尺度比那些只需要细胞质或外源性膜蛋白的运动。这种差异可能是由于膜整合蛋白的扩散受限。可能需要多种开关机制来调节不同时间尺度上的电子传输。
Cyanobacteria possess multiple mechanisms for regulating the pathways of photosynthetic and respiratory electron transport. Electron transport may be regulated indirectly by controlling the transfer of excitation energy from the light-harvesting complexes, or it may be more directly regulated by controlling the stoichiometry, localization, and interactions of photosynthetic and respiratory electron transport complexes. Regulation of the extent of linear vs. cyclic electron transport is particularly important for controlling the redox balance of the cell. This review discusses what is known of the regulatory mechanisms and the timescales on which they occur, with particular regard to the structural reorganization needed and the constraints imposed by the limited mobility of membrane-integral proteins in the crowded thylakoid membrane. Switching mechanisms requiring substantial movement of integral thylakoid membrane proteins occur on slower timescales than those that require the movement only of cytoplasmic or extrinsic membrane proteins. This difference is probably due to the restricted diffusion of membrane-integral proteins. Multiple switching mechanisms may be needed to regulate electron transport on different timescales.
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