Institute of Physics, A. Gostauto 12, 2600, Vilnius, Lithuania.
Photosynth Res. 1995 Feb;43(2):149-54. doi: 10.1007/BF00042972.
The energy transfer and trapping kinetics in the core antenna of Photosystem I are described in a new model in which the distance between the core antenna chlorophylls and P700 is proposed to be considerably longer than the distance between the chlorophylls within the antenna. Structurally, the model describes the Photosystem I core antenna as a regular sphere around P700, while energetically it consists of three levels representing the bulk antenna, P700 and the red-shifted antenna pigments absorbing at longer wavelength than P700, respectively. It is shown that the model explains experimental results obtained from the Photosystem I complex of the cyanobacterium Synechococcus sp. (A.R. Holzwarth, G. Schatz, H Brock, and E. Bittersman (1993) Biophys. J. 64: 1813-1826) quite well, and that no unrealistic charge separation rate and organization of the long-wavelength pigments has to be assumed. We suggest that excitation energy transfer and trapping in Photosystem I should be described as a 'transfer-to-the-trap'-limited process.
在一个新模型中描述了光合作用系统 I 核心天线中的能量转移和俘获动力学，该模型提出核心天线叶绿素与 P700 之间的距离比天线内叶绿素之间的距离长得多。在结构上，该模型将光合作用系统 I 核心天线描述为围绕 P700 的规则球体，而在能量上，它由三个能级组成，分别代表 bulk antenna、P700 和吸收波长长于 P700 的红移天线色素。结果表明，该模型很好地解释了从蓝细菌 Synechococcus sp. 的光合作用系统 I 复合物中获得的实验结果（A.R. Holzwarth、G. Schatz、H Brock 和 E. Bittersman（1993）Biophys. J. 64: 1813-1826），并且不需要假设不合理的电荷分离速率和长波长色素的组织。我们建议，光合作用系统 I 中的激发能转移和俘获应被描述为“转移到陷阱”限制过程。
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