Redox and ATP control of photosynthetic cyclic electron flow in Chlamydomonas reinhardtii (II) Involvement of the PGR5-PGRL1 pathway under anaerobic conditions
Redox and ATP control of photosynthetic cyclic electron flow in Chlamydomonas reinhardtii (II) Involvement of the PGR5-PGRL1 pathway under anaerobic conditions
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DOI：
10.1016/j.bbabio.2014.01.024
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发表时间：
2014-06-01
影响因子：
4.3
通讯作者：
Alric, Jean
中科院分区：
文献类型：
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作者：
Alric, Jean
在氧合光合作用中，围绕光系统I的循环电子流动表示电子从基质电子载体(还原的烟酰胺腺嘌呤二核苷酸磷酸，NADPH，铁还蛋白)循环到质醌池。循环电子流在衣藻和植物中是否有类似的作用一直是一个有争议的问题。这里我们想强调的是，尽管绿藻和植物之间可能存在调控或代谢上的差异，但循环电子流的一般机制似乎在物种之间是保守的。描述循环电子流最准确的方法仍然是氧化还原平衡模型，而类囊体膜的超分子重组(状态转变)对循环电子流的最大速率几乎没有影响。在用3-(3，4-二氯苯基)-1，1-二甲基脲(DCMU)处理的衣藻细胞中，循环路径的最大容量约为每个光系统每秒60个电子的转移，并置于缺氧条件下。这项工作的第一部分(需氧条件)发表在上一期的BBA-生物能量学(1797卷，第44-51页)上(Alric等人，2010年)。(C)2014爱思唯尔B.V.保留所有权利。
In oxygenic photosynthesis, cyclic electron flow around photosystem I denotes the recycling of electrons from stromal electron carriers (reduced nicotinamide adenine dinucleotide phosphate, NADPH, ferredoxin) towards the plastoquinone pool. Whether or not cyclic electron flow operates similarly in Chlamydomonas and plants has been a matter of debate. Here we would like to emphasize that despite the regulatory or metabolic differences that may exist between green algae and plants, the general mechanism of cyclic electron flow seems conserved across species. The most accurate way to describe cyclic electron flow remains to be a redox equilibration model, while the supramolecular reorganization of the thylakoid membrane (state transitions) has little impact on the maximal rate of cyclic electron flow. The maximum capacity of the cyclic pathways is shown to be around 60 electrons transferred per photosystem per second, which is in Chlamydomonas cells treated with 3 (3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) and placed under anoxic conditions. Part I of this work (aerobic conditions) was published in a previous issue of BBA-Bioenergetics (vol. 1797, pp. 44-51) (Alric et al., 2010). (C) 2014 Elsevier B.V. All rights reserved.