Antenna size dependent exciton dynamics in the chlorosomal antenna of the green bacterium Chloroflexus aurantiacus

FEBS Letters

Novoderezhkin, Vladimir¹  Taisova, Alexandra¹  Timpmann, Kiu²  Fetisova, Zoya¹  Freiberg, Arvi² 

[1] A. N. Belozersky Institute of Physico-Chemical Biology, Moscow State University, 119899 Moscow, Russia;Institute of Physics, Estonian Acad. Sci., 2020400 Tartu, Estonia

关键词: Bacterial photosynthesis;    Excitation energy transfer;    Light-harvesting antenna;    Green bacteria;    Chlorosome;    BChl;    bacteriochlorophyll;   

DOI  :  10.1016/0014-5793(96)00164-0

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

Using picosecond fluorescence spectroscopy, we demonstrated antenna size dependent exciton dynamics in chlorosomal antenna, measured for intact cells of different cultures of the green bacterium Chloroflexus aurantiacus with different chlorosomal antenna size determined by electron microscopic examination of ultrathin sections of the cells. The measured bacteriochlorophyll (BChl) c excitation lifetimes show a quasilinear dependence on chlorosome size as predicted in our model for cylindrical exciton migration within the three-dimensional chlorosomal antenna. The migration model was developed for the proposed exciton model of chlorosomal BChl c aggregation. The data predict the time constant values for excitation energy transfer between BChl c aggregates as well as to BChl a of the baseplate.

【 授权许可】

Unknown