Regulating the Energy Flow in a Cyanobacterial Light-Harvesting Antenna Complex
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- 作者：Ido EisenbergFelipe Caycedo-Soler ; Dvir Harris ; Shira Yochelis ; Susana F. Huelga ; Martin B. Plenio ; Noam Adir ; Nir Keren ; Yossi Paltiel
- 刊名：Journal of Physical Chemistry B
- 出版年：2017
- 出版时间：February 16, 2017
- 年：2017
- 卷：121
- 期：6
- 页码：1240-1247
- 全文大小：610K
- ISSN：1520-5207
文摘
Photosynthetic organisms harvest light energy, utilizing the absorption and energy-transfer properties of protein-bound chromophores. Controlling the harvesting efficiency is critical for the optimal function of the photosynthetic apparatus. Here, we show that the cyanobacterial light-harvesting antenna complex may be able to regulate the flow of energy to switch reversibly from efficient energy conversion to photoprotective quenching via a structural change. We isolated cyanobacterial light-harvesting proteins, phycocyanin and allophycocyanin, and measured their optical properties in solution and in an aggregated-desiccated state. The results indicate that energy band structures are changed, generating a switch between the two modes of operation, exciton transfer and quenching, achieved without dedicated carotenoid quenchers. This flexibility can contribute greatly to the large dynamic range of cyanobacterial light-harvesting systems.