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首页> 美国卫生研究院文献>Proceedings of the National Academy of Sciences of the United States of America >Redox potentials of primary electron acceptor quinone molecule (QA)− and conserved energetics of photosystem II in cyanobacteria with chlorophyll a and chlorophyll d
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Redox potentials of primary electron acceptor quinone molecule (QA)− and conserved energetics of photosystem II in cyanobacteria with chlorophyll a and chlorophyll d

机译：叶绿素a和叶绿素d的蓝细菌中主电子受体醌分子（QA）-的氧化还原势和光系统II的守恒能量。

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In a previous study, we measured the redox potential of the primary electron acceptor pheophytin (Phe) a of photosystem (PS) II in the chlorophyll d–dominated cyanobacterium Acaryochloris marina and a chlorophyll a–containing cyanobacterium, Synechocystis. We obtained the midpoint redox potential (Em) values of −478 mV for A. marina and −536 mV for Synechocystis. In this study, we measured the redox potentials of the primary electron acceptor quinone molecule (QA), i.e., Em(QA/QA−), of PS II and the energy difference between [P680·Phe a−·QA] and [P680·Phe a·QA−], i.e., ΔGPhQ. The Em(QA/QA−) of A. marina was determined to be +64 mV without the Mn cluster and was estimated to be −66 to −86 mV with a Mn-depletion shift (130–150 mV), as observed with other organisms. The Em(Phe a/Phe a−) in Synechocystis was measured to be −525 mV with the Mn cluster, which is consistent with our previous report. The Mn-depleted downshift of the potential was measured to be approximately −77 mV in Synechocystis, and this value was applied to A. marina (−478 mV); the Em(Phe a/Phe a−) was estimated to be approximately −401 mV. These values gave rise to a ΔGPhQ of −325 mV for A. marina and −383 mV for Synechocystis. In the two cyanobacteria, the energetics in PS II were conserved, even though the potentials of QA− and Phe a− were relatively shifted depending on the special pair, indicating a common strategy for electron transfer in oxygenic photosynthetic organisms.
机译：在先前的研究中，我们测量了叶绿素d为主的蓝藻滨海蓝藻和含叶绿素a的蓝藻蓝藻（Synechochocystis）中光系统（PS）II的主要电子受体脱镁叶绿素（Phe）a的氧化还原电位。我们获得的中点氧化还原电位（Em）值对于滨海曲霉为-478 mV，对于集胞藻为-536 mV。在这项研究中，我们测量了PS II的初级电子受体醌分子（QA）的氧化还原电位，即Em（QA / QA -）和[P680·Phe a -·QA]和[P680·Phe a·QA -]，即ΔGPhQ。滨海假单胞菌的Em（QA / QA -）被确定为+64 mV（无Mn团簇），估计为-66至-86 mV（有Mn耗尽位移）（130– 150 mV），与其他生物观察到的一样。用锰簇测定的 Synechocystis 中的Em（Phe a / Phe a -）为-525 mV，这与我们的以前的报告。在囊藻中测得的Mn耗尽电位的下移约为-77 mV，并将此值应用于 A。码头（−478 mV）; E m（Phe a / Phe a -）估计约为-401 mV。这些值导致 A的Δ G PhQ为-325 mV。游动藻（Synechocystis）的码头和−383 mV。在这两个蓝细菌中，即使QA -和Phe a -的电势根据特殊的一对，表明在氧合光合生物中电子转移的通用策略。

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