球形红细菌B800 - 850光捕获复合物中能量转移的飞秒动力学
Femtosecond dynamics of energy transfer in B800-850 light-harvesting complexes of Rhodobacter sphaeroides.
作者信息
Trautman J K, Shreve A P, Violette C A, Frank H A, Owens T G, Albrecht A C
机构信息
Department of Chemistry, Cornell University, Ithaca, NY 14853.
出版信息
Proc Natl Acad Sci U S A. 1990 Jan;87(1):215-9. doi: 10.1073/pnas.87.1.215.
Abstract
We report femtosecond transient absorption studies of energy transfer dynamics in the B800-850 light-harvesting complex (LHC) of Rhodobacter sphaeroides 2.4.1. For complexes solubilized in lauryldimethylamine-N-oxide (LDAO), the carotenoid to bacteriochlorophyll (Bchl) B800 and carotenoid to Bchl B850 energy transfer times are 0.34 and 0.20 ps, respectively. The B800 to B850 energy transfer time is 2.5 ps. For complexes treated with lithium dodecyl sulfate (LDS), a carotenoid to B850 energy transfer time of less than or equal to 0.2 ps is seen, and a portion of the total carotenoid population is decoupled from Bchl. In both LDAO-solubilized and LDS-treated complexes an intensity-dependent picosecond decay component of the excited B850 population is ascribed to excitation annihilation within minimal units of the LHC.
摘要
我们报告了对球形红细菌2.4.1的B800 - 850光捕获复合物（LHC）中能量转移动力学的飞秒瞬态吸收研究。对于溶解在月桂基二甲基氧化胺（LDAO）中的复合物，类胡萝卜素到细菌叶绿素（Bchl）B800以及类胡萝卜素到Bchl B850的能量转移时间分别为0.34皮秒和0.20皮秒。B800到B850的能量转移时间为2.5皮秒。对于用十二烷基硫酸钠（LDS）处理的复合物，观察到类胡萝卜素到B850的能量转移时间小于或等于0.2皮秒，并且总类胡萝卜素群体的一部分与Bchl解耦。在LDAO溶解的复合物和LDS处理的复合物中，激发的B850群体的强度依赖性皮秒衰减成分归因于LHC最小单元内的激发湮灭。
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