Dependence of singlet-energy transfer on the conjugation length of carotenoids reconstituted into the LH1 complex from Rhodospirillum rubrum G9
Dependence of singlet-energy transfer on the conjugation length of carotenoids reconstituted into the LH1 complex from Rhodospirillum rubrum G9
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DOI：
10.1016/j.cplett.2004.06.021
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发表时间：
2004-07-21
影响因子：
2.8
通讯作者：
Koyama, Y
中科院分区：
文献类型：
--
作者：
Akahane, J;Rondonuwu, FS;Koyama, Y
将共轭双键数n = 9、10、11、12和13的类胡萝卜素（神经孢红素、球红素、番茄红素、无水弧菌素和螺旋黄质）掺入红红螺旋藻G9的LH1天线配合物中，通过亚皮秒时间分辨吸收光谱测定了类胡萝卜素-细菌叶绿素（Cars-BChl）单线态能量转移效率分别为78%、75%、46%、40%和36%。在n = 9和10的类胡萝卜素中，1B(u)（+）、IBu+和2A(g)（-）通道全部打开，而在n = 11-13的类胡萝卜素中，1B(u)（-）和2A(g)（-）通道关闭，导致从n = 10到11的效率突然下降。(C) 2004 Elsevier B.V.版权所有
A set of carotenoids, i.e., neurosporene, spheroidene, lycopene, anhydrorbodovibrin and spirilloxanthin, having the number of conjugated double bonds n = 9, 10, 11, 12 and 13, were incorporated into the LH1 antenna complex from Rhodospirillum rubrum G9, and the carotenoid-bacteriochlorophyll (Cars-BChl) singlet energy-transfer efficiencies were determined by subpicosecond time-resolved absorption spectroscopy to be 78%, 75%, 46%, 40% and 36%, respectively. In carotenoids with n = 9 and 10, all the 1B(u)(+), IBu+ and 2A(g)(-) channels were open, whereas in carotenoids with n = 11-13 the 1B(u)(-) and 2A(g)(-) channels were closed, causing a sudden drop in the efficiency on going from n = 10 to 11. (C) 2004 Elsevier B.V. All rights reserved.