Bandwidth of excitons in LH2 bacterial antenna chromoproteins

被引：29

作者：

Timpmann, K

Trinkunas, G

Olsen, JD

Hunter, CN

Freiberg, A

机构：

[1] Univ Tartu, Inst Phys, EE-51014 Tartu, Estonia

[2] Inst Phys, LT-02300 Vilnius, Lithuania

[3] Univ Sheffield, Robert Hill Inst Photosynth, Sheffield S10 2TN, S Yorkshire, England

[4] Univ Sheffield, Krebs Inst Biomol Res, Sheffield S10 2TN, S Yorkshire, England

[5] Univ Tartu, Inst Mol & Cell Biol, EE-51010 Tartu, Estonia

来源：

CHEMICAL PHYSICS LETTERS | 2004年 / 398卷 / 4-6期

基金：

英国生物技术与生命科学研究理事会;

关键词：

D O I：

10.1016/j.cplett.2004.09.090

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：

The bandwidth of the exciton manifold in LH2 peripheral antenna complexes from the photosynthetic bacterium Rhodobacter sphaeroides has been determined using polarized fluorescence excitation spectroscopy and model simulations. It is shown that the fluorescence anisotropy spectra reveal a hidden structure of the exciton band that is correlated with its boundaries. The estimated exciton coupling energy and exciton bandwidth in the native complex is similar to360 and similar to1620 cm(-1), respectively. The corresponding numbers in a mutant with the B800 bacteriochlorophyll molecules absent are somewhat larger (similar to420 and similar to1890 cm(-1)), probably due to tightening of the protein structure. (C) 2004 Elsevier B.V. All rights reserved.

引用

收藏

页码：384 / 388

页数：5

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