PHOTOSYSTEM-II HETEROGENEITY - THE ACCEPTOR SIDE
PHOTOSYSTEM-II HETEROGENEITY - THE ACCEPTOR SIDE
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DOI：
10.1007/bf00033157
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发表时间：
1990-09-01
影响因子：
3.7
通讯作者：
GOVINDJEE
中科院分区：
文献类型：
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作者：
GOVINDJEE
众所周知，在含氧光合作用中，需要两个光系统 I 和 II 将电子从 H2O 转移到 NADP+。每个光系统由几个组件组成：（a）光捕获天线（L-HA）系统，（b）反应中心（RC）复合体，以及（c）参与电子和质子传输的多肽和其他辅助因子。首先，我们对光系统 II (PS II) 的电子受体侧已确定的异质性进行简要回顾，包括 (a) L-HA 系统：PS II.alpha。和 PS II.beta。单元，(b)含有电子受体Q1或Q2的RC络合物； (c)电子受体复合物：QA(具有两种不同的氧化还原电势QL和QH)和QB(QB型；QB''型；和非QB型)；还提到了其他成分，例如铁 (Q-400)、U (Em,7 = -450 mV) 和 Q-318（或 Aq）。此外，我们总结了当前关于所谓的非活性（那些将电子相当缓慢地转移到质体醌池）和活性反应中心的想法。其次，我们讨论第一阶段对 PS II 反应中心（RC-II）和 PS I 反应中心（RC-I）比率的影响。第三，我们回顾了最近的结果，这些结果将使用醌 DMQ 和 DCBQ 获得的无活性和活性 RC-II 与室温下以及加热的菠菜和大豆类囊体中的荧光瞬态相关联。这些数据表明，非活性 RC-II 可以通过荧光瞬态的 OID 相轻松监测，并且加热会将活性中心转化为非活性中心。
It is well known that two photosystems, I and II, are needed to transfer electrons from H2O to NADP+ in oxygenic photosynthesis. Each photosystem consists of several components: (a) the light-harvesting antenna (L-HA) system, (b) the reaction center (RC) complex, and (c) the polypeptides and other co-factors involved in electron and proton transport. First, we present a mini review on the heterogeneity which has been identified with the electron acceptor side of Photosystem II (PS II) including (a) L-HA system: the PS II.alpha. and PS II.beta. units, (b) RC complex containing electron acceptor Q1 or Q2; and (c) electron acceptor complex: QA (having two different redox potentials QL and QH) and QB (QB-type; QB'' type; and non-QB type); additional components such as iron (Q-400), U (Em,7 = -450 mV) and Q-318 (or Aq) are also mentioned. Furthermore, we summarize the current ideas on the so-called inactive (those that transfer electrons to the plastoquinone pool rather slowly) and active reaction centers. Second, we discuss the bearing of the first session on the ratio of the PS II reaction center (RC-II) and the PS I reaction center (RC-I). Third, we review recent results that relate the inactive and active RC-II, obtained by the use of quinones DMQ and DCBQ, with the fluorescence transient at room temperature and in heated spinach and soybean thylakoids. These data show that inactive RC-II can be easily monitored by the OID phase of fluorescence transient and that heating converts active into inactive centers.