Discrepancy between experimental and theoretical excitation transfer rates in LH2 bacteriochlorophyll-protein complexes of purple bacteria

被引:4
作者
Borisov, A. Y. [1 ]
机构
[1] Moscow MV Lomonosov State Univ, AN Belozersky Inst Physicochem Biol, Moscow 119992, Russia
来源
EUROPEAN BIOPHYSICS JOURNAL WITH BIOPHYSICS LETTERS | 2008年 / 37卷 / 02期
关键词
purple bacteria; LH2; excitation migration;
D O I
10.1007/s00249-007-0200-0
中图分类号
Q6 [生物物理学];
学科分类号
071011 ;
摘要
Discrepancy is revealed between the values of excitation transfer times measured experimentally, and those calculated, for the atomic structures of B800 -> B850 bacteriochlorophylls within the LH2 light-harvesting pigment-protein complex of the purple bacterium Rhodopseudomonas acidophila. The value 2.9-3.2 ps for the B800 -> B850 excitation transfer, calculated on the basis of atomic structure of LH2, is about 4-times longer than that measured for this bacterium (0.7 ps). This discrepancy appears common in at least two purple bacteria. Possible sources responsible for this discrepancy are discussed. It may either signify some drawback/s/ in our notions about the precise in vivo structure of LH2 complexes, for example, possible changes of LH2 structure during crystallization, or it may reflect our ignorance of some mechanisms involved in excitation migration.
引用
收藏
页码:143 / 151
页数:9
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