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光合细菌Rhodopseudomonas palustris捕光天线LH2中类胡萝卜素分子间三重态能量传递的光谱学证据 被引量:6

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摘要 紫色光合细菌Rhodopseudomonas (Rps.) palustris的外周捕光天线LH2含有多种类胡萝卜素分子(Car), 研究多种共存的Car的生理学功能具有重要意义. 文中采用纳秒时间分辨吸收光谱手段分别在生理学温度(室温)和低温(77 K)下研究了Car三重激发态(3Car* )的动力学行为. 在用纳秒光脉冲选择性地激发Car后记录到其宽带、非对称的三重态吸收( Tn ←T1 )光谱, 这一光谱特征是由含不同C = C共轭双键数目(N)的Car所致. 不同Car对Tn ←T1吸收谱的贡献在室温下严重交叠, 在低温下却可以清晰辨别. 在室温下Tn ←T1吸收峰的短波侧随探测光延时的增加而变窄, 历经约1 μs达到光谱平衡, 但在低温下同样的光谱动力学却并不显著. 上述光谱动力学变化被解释为不同Car间的激发态平衡过程. 对室温下的时间分辨光谱的全局分析(Global Analysis) 分离出峰值波长在545和565 nm的两个主要光谱组分, 分别被指认为N = 11和13的Car的Tn ←T1吸收光谱. 短波长组分的寿命为0.72 μs (空气饱和样品)和1.36 μs (生物除氧样品), 而对应的长波长组分的寿命为2.12和3.75 μs. 这种N小的Car寿命短的反常行为表明不同共轭链长度的Car间可能存在着三重激发态能量传递, 由此推测Rps. Palustris的LH2中单个α,β-亚基内存在两种不同共轭长度的Car.
出处 《中国科学(B辑)》 CSCD 北大核心 2003年第5期385-396,共12页 Science in China(Series B)
基金 国家重点基础研究发展规划项目(批准号:G1998010100) 国家自然科学基金(批准号:39890390) 国家自然科学基金(批准号:20133020)
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参考文献22

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同被引文献76

  • 1FENG Juan, WANG Qian, ZHANG Xujia, HUANG Youguo, Al Xicheng, ZHANG Xingkang & ZHANG JianpingState Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China,National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China.Spectroscopic evidence for triplet excitation energy transfer among carotenoids in the LH2 complex from photosynthetic bacterium Rhodopseudomonas palustris[J].Science China Chemistry,2004,47(1):80-90. 被引量:8
  • 2刘源,高金鹏,徐春和.紫细菌捕光色素蛋白复合体及光化学反应中心的研究进展[J].植物生理与分子生物学学报,2005,31(6):567-574. 被引量:6
  • 3张晓蓉,马文丽,杨素萍.产氢红杆菌类胡萝卜素代谢研究[J].山西大学学报(自然科学版),2006,29(2):201-204. 被引量:5
  • 4刘伟民,刘源,徐春和,钱士雄.紫细菌Rb.Sphaeroides601外周捕光天线(LH2) B800吸收带的超快动力学研究[J].物理学报,2006,55(9):4472-4477. 被引量:1
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