The dependence of excitation energy transfer pathways on conjugation length of carotenoids in purple bacterial photosynthetic antennae

The dependence of excitation energy transfer pathways on conjugation length of carotenoids in purple bacterial photosynthetic antennae
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紫色细菌光合触角中激发能量传递途径对类胡萝卜素共轭长度的依赖性

DOI:
10.1002/pssb.201000687
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发表时间:
2010
期刊:
physica status solidi (b)
影响因子:
--
通讯作者:
Maruta S
Maruta S
中科院分区:
--
文献类型:
--
作者:
Maruta S

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超快激发态动力学的类胡萝卜素在溶液中,并绑定到色素-蛋白质复合物已被研究飞秒泵浦-探测光谱测量。类胡萝卜素和细菌叶绿素之间可能的激发能转移(EET)途径及其效率强烈依赖于类胡萝卜素的共轭长度。在Rhodobacter sphaeroides 2.4.1中,观察到类胡萝卜素激发时从类胡萝卜素到细菌叶绿素的双EET通道(S2→ Qx和S1→ Qy)。另一方面,在红杜鹃S1中,类胡萝卜素激发时S1→ Qy的EET途径被关闭,而细菌叶绿素激发时清楚地观察到从细菌叶绿素到类胡萝卜素的反向能量转移。类胡萝卜素在捕光复合物中的作用在其共轭长度方面进行了讨论。
Ultrafast excited state dynamics of carotenoids in solution and bound to pigment–protein complexes have been investigated by femtosecond pump‐probe spectroscopic measurements. Possible excitation energy transfer (EET) pathways between carotenoids and bacteriochlorophylls and their efficiency depend strongly on the conjugation length of carotenoids. In the case ofRhodobacter sphaeroides2.4.1, dual EET channels from carotenoid to bacteriochlorophyll (S2→ Qxand S1→ Qy) upon excitation of carotenoid were observed. In the case ofRhodospirillum rubrumS1, on the other hand, the EET pathway of S1→ Qyupon excitation of carotenoid was closed, whereas reverse energy transfer from bacteriochlorophyll to carotenoid was clearly observed upon excitation of bacteriochlorophyll. The role of carotenoids in the light‐harvesting complexes is discussed in terms of their conjugation length.
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