通过超快泵浦-探测光谱揭示的橙色绿屈挠菌细菌叶绿素c天线中的激发离域。

Excitation delocalization in the bacteriochlorophyll c antenna of the green bacterium Chloroflexus aurantiacus as revealed by ultrafast pump-probe spectroscopy.

作者信息

Savikhin S, Buck D R, Struve W S, Blankenship R E, Taisova A S, Novoderezhkin V I, Fetisova Z G

机构信息

Ames Laboratory-USDOE and Department of Chemistry, Iowa State University, 50011, USA.

出版信息

FEBS Lett. 1998 Jul 3;430(3):323-6. doi: 10.1016/s0014-5793(98)00691-7.

DOI:10.1016/s0014-5793(98)00691-7

PMID:9688564

Abstract

Room temperature absorption difference spectra were measured on the femtosecond through picosecond time scales for chlorosomes isolated from the green bacterium Chloroflexus aurantiacus. Anomalously high values of photoinduced absorption changes were revealed in the BChl c Qy transition band. Photoinduced absorption changes at the bleaching peak in the BChl c band were found to be 7-8 times greater than those at the bleaching peak in the BChl a band of the chlorosome. This appears to be the first direct experimental proof of excitation delocalization over many BChl c antenna molecules in the chlorosome.

摘要

在飞秒至皮秒时间尺度上，测量了从橙色绿弯菌中分离出的叶绿体在室温下的吸收差异光谱。在细菌叶绿素c的Qy跃迁带中，发现了异常高的光致吸收变化值。结果发现，细菌叶绿素c带漂白峰处的光致吸收变化比叶绿体中细菌叶绿素a带漂白峰处的光致吸收变化大7至8倍。这似乎是首次直接实验证明了叶绿体中许多细菌叶绿素c天线分子上的激发离域。