Unusual temperature quenching of bacteriochlorophyll a fluorescence in FMO antenna protein trimers

被引：13

作者：

Ratsep, Margus

Freiberg, Arvi

机构：

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

[2] Univ Tartu, Inst Mol & Cell Biol, EE-51014 Tartu, Estonia

来源：

CHEMICAL PHYSICS LETTERS | 2007年 / 434卷 / 4-6期

关键词：

D O I：

10.1016/j.cplett.2006.12.013

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：

Strong thermally induced quenching of fluorescence emission intensity of the Fenna-Matthews-Olson trimeric bacteriochlorophyll a - protein antenna complex from the green photosynthetic bacterium Chlorobium tepidum is observed starting already from 2 K, very different from that for other antenna complexes as well as for bacteriochlorophyll a in common solutions where the emission yield decreases only slightly past 100 K. Close spacing of the trimer exciton states within the lowest-energy manifold of absorbing states around 826 nm along with significant increase of the electron-phonon coupling strength toward higher energies is proposed responsible for this effect. (c) 2006 Elsevier B.V. All rights reserved.

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收藏

页码：306 / 311

页数：6

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