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首页> 外文期刊>Biochemical and Biophysical Research Communications >Effect of the in situ electrochemical oxidation on the pigment-protein arrangement and energy transfer in light-harvesting complex from Rhodobacter sphaeroides 601.
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Effect of the in situ electrochemical oxidation on the pigment-protein arrangement and energy transfer in light-harvesting complex from Rhodobacter sphaeroides 601.

机译：原位电化学氧化对球形红球菌601采光复合物中色素-蛋白质排列和能量转移的影响。

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摘要

The oxidation of bacteriochlorophylls (BChls) in peripheral light-harvesting complexes (LH2) from Rhodobacter sphaeroides was investigated by spectroelectrochemistry of absorption, fluorescence emission, and femtosecond (fs) pump-probe, with the aim obtaining information about the effect of in situ electrochemical oxidation on the pigment-protein arrangement and energy transfer within LH2. The experimental results revealed that: (a) the generation of the BChl radical cation in both B800 and B850 rings dramatically induced bleaching of the characteristic absorption in the NIR region and quenching of the fluorescence emission from the B850 ring for the electrochemical oxidized LH2; (b) the BChl-B850 radical cation might act as an additional channel to compete with the unoxidized BChl-B850 molecules for rapidly releasing the excitation energy, however the B800-B850 energy transfer rate remained almost unchanged during the oxidation process.
机译：通过吸收，荧光发射和飞秒（fs）泵浦探针的光谱电化学研究了球形球形红细菌周围光采复合物（LH2）中细菌叶绿素（BChls）的氧化，目的是获得有关原位电化学效应的信息。色素-蛋白质排列上的氧化和LH2内的能量转移。实验结果表明：（a）在B800和B850环中均产生BChl自由基阳离子，显着诱导了NIR区域特征吸收的漂白和B850环对电化学氧化LH2的荧光发射的猝灭; （b）BChl-B850自由基阳离子可能充当与未氧化的BChl-B850分子竞争以快速释放激发能的附加通道，但是在氧化过程中B800-B850的能量传递速率几乎保持不变。

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