Robustness and optimality of light harvesting in cyanobacterial photosystem I

被引:121
作者
Sener, MK
Lu, DY
Ritz, T
Park, S
Fromme, P
Schulten, K [1 ]
机构
[1] Univ Illinois, Beckman Inst, Urbana, IL 61801 USA
[2] Univ Illinois, Dept Phys, Urbana, IL 61801 USA
[3] Virginia Polytech Inst & State Univ, Dept Biol, Blacksburg, VA 24061 USA
[4] Tech Univ Berlin, Max Volmer Laboratorium Biophys Chem, Inst Chem, Fak 2, D-10623 Berlin, Germany
[5] Arizona State Univ, Dept Chem & Biochem, Tempe, AZ 85287 USA
关键词
D O I
10.1021/jp020708v
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
As most biological species, photosynthetic lifeforms have evolved to function optimally, despite thermal disorder and with fault tolerance. It remains a challenge to understand how this is achieved. To address this challenge, the function of the protein-pigment complex photosystem I (PSI) of the cyanobacterium Synechococcus elongatus is investigated theoretically. The recently obtained high-resolution structure of this complex exhibits an aggregate of 96 chlorophylls that are electronically coupled to function as a light-harvesting antenna complex. This paper constructs an effective Hamiltonian for the chlorophyll aggregate to describe excitation transfer dynamics and spectral properties of PSI. For this purpose, a new kinetic expansion method, the sojourn expansion, is introduced. Our study shows that at room temperature fluctuations of site energies have little effect on the calculated excitation lifetime and quantum yield, which compare favorably with experimental results. The efficiency of the system is found to be robust against "pruning" of individual chlorophylls. An optimality of the arrangement of chlorophylls is identified through the quantum yield in comparison with an ensemble of randomly oriented chlorophylls, though the quantum yield is seen to change only within a narrow interval in such an ensemble.
引用
收藏
页码:7948 / 7960
页数:13
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