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首页> 外文期刊>Biochemistry >UNIVERSALITY OF ENERGY AND ELECTRON TRANSFER PROCESSES IN PHOTOSYSTEM I
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UNIVERSALITY OF ENERGY AND ELECTRON TRANSFER PROCESSES IN PHOTOSYSTEM I

机译：光电系统中能量和电子传输过程的普遍性

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摘要

Femtosecond transient absorption spectroscopy has been used to investigate the photoinduced energy and electron transfer processes in photosystem I (PS I) particles from cyanobacteria, green algae, and higher plants. At room temperature, the kinetics observed in all three species are very similar: Following 590 nm excitation, an equilibration process(es) with a 3.7-7.5 ps lifetime was observed, followed by a 19-24 ps process that is associated with trapping. In all three species long-wavelength pigments (pigments that absorb at longer wavelengths than the primary electron donor) were observed. The difference spectrum associated with reduction of the primary electron acceptor [(A(0)(-) - A(0)) difference spectrum] was obtained for all three species. The (A(0)(-) - A(0)) difference spectra obtained from measurements using detergent-isolated PS I particles from spinach and Chlamydonmonas reinhardtii are similar but clearly different from the (A(0)(-) - A(0)) difference spectrum obtained from measurements using PS I cyanobacterial membrane fragments. In all three species the reduced primary electron acceptor (A(0)(-)) is reoxidized extremely rapidly, in about 20 ps. The difference spectrum associated with A(0) reduction appears to contain contributions from more than a single chlorophyll pigment.
机译：飞秒瞬态吸收光谱法已用于研究蓝细菌，绿藻和高等植物的光系统I（PS I）粒子中的光诱导能量和电子转移过程。在室温下，在所有三种物质中观察到的动力学非常相似：在590 nm激发后，观察到寿命为3.7-7.5 ps的平衡过程，然后是与捕获相关的19-24 ps的过程。在所有三种物种中，均观察到长波长颜料（吸收的波长比初级电子供体更长的颜料）。对于所有三个种类，获得了与初级电子受体的还原相关的差异光谱[（A（0）（-）-A（0））差异光谱]。使用菠菜和莱茵衣藻的去污剂分离的PS I颗粒通过测量获得的（A（0）（-）-A（0））差异光谱与（A（0）（-）-A（ 0））通过使用PS I蓝细菌膜片段进行测量获得的差异光谱。在所有这三种物质中，还原的伯电子受体（A（0）（-））在约20 ps内被极快地再氧化。与A（0）减少相关的差异光谱似乎包含来自多个叶绿素色素的贡献。

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