中国物理B ›› 2006, Vol. 15 ›› Issue (8): 1725-1730.doi: 10.1088/1009-1963/15/8/016

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Effect of the mutation of carotenoids on the dynamics of energy transfer in light-harvesting complexes (LH2) from Rhodobacter sphaeroides 601 at room temperature

郭立俊1, 刘伟民2, 刘康俊2, 闫永丽2, 钱士雄2, 刘　源3, 徐春和3   

  1. (1)hysics Department, Henan University, Kaifeng 475001,China; (2)Physics Department, Fudan University, Shanghai 200433, China; (3)Shanghai Institute of Plant Physiology & Ecology, Shanghai institute for Biological Sciences, Chinese Academy of Sciences, Shanghai 200032, China
  • 收稿日期:2006-01-07 修回日期:2006-04-20 出版日期:2006-08-20 发布日期:2006-08-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10274013).

Effect of the mutation of carotenoids on the dynamics of energy transfer in light-harvesting complexes (LH2) from Rhodobacter sphaeroides 601 at room temperature

Liu Wei-Min(刘伟民)a), Liu Yuan(刘源)b), Liu Kang-Jun(刘康俊)a), Yan Yong-Li(闫永丽)a), Guo Li-Jun(郭立俊)c), Xu Chun-He(徐春和)b), and Qian Shi-Xiong(钱士雄)a)†   

  1. a Physics Department, Fudan University, Shanghai 200433, China; b Shanghai Institute of Plant Physiology & Ecology, Shanghai institute for Biological Sciences, Chinese Academy of Sciences, Shanghai 200032, China; c Physics Department, Henan University, Kaifeng 475001, China
  • Received:2006-01-07 Revised:2006-04-20 Online:2006-08-20 Published:2006-08-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10274013).

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摘要： Energy transfers in two kinds of peripheral light-harvesting complexes (LH2) of {Rhodobacter sphaeroides} (RS) 601 are studied by using femtosecond pump--probe spectroscopy with tunable laser wavelength at room temperature. These two complexes are native LH2 (RS601) and green carotenoid mutated LH2 (GM309). The obtained results demonstrate that, compared with spheroidenes with ten conjugated double bonds in native RS601, carotenoid in GM309 containing neurosporenes with nine conjugated double bonds can lead to a reduction in energy transfer rate in the B800-to-B850 band and the disturbance in the energy relaxation processes within the excitonic B850 band.

关键词: light harvesting complex (LH2), carotenoid mutation, energy transfer, femtosecond pumpprobe

Abstract: Energy transfers in two kinds of peripheral light-harvesting complexes (LH2) of Rhodobacter sphaeroides (RS) 601 are studied by using femtosecond pump--probe spectroscopy with tunable laser wavelength at room temperature. These two complexes are native LH2 (RS601) and green carotenoid mutated LH2 (GM309). The obtained results demonstrate that, compared with spheroidenes with ten conjugated double bonds in native RS601, carotenoid in GM309 containing neurosporenes with nine conjugated double bonds can lead to a reduction in energy transfer rate in the B800-to-B850 band and the disturbance in the energy relaxation processes within the excitonic B850 band.

Key words: light harvesting complex (LH2), carotenoid mutation, energy transfer, femtosecond pumpprobe

中图分类号:  (Spectra of biomolecules)

  • 87.15.M-
87.16.-b (Subcellular structure and processes) 87.15.R- (Reactions and kinetics) 87.15.K- (Molecular interactions; membrane-protein interactions) 87.15.H- (Dynamics of biomolecules) 87.15.B- (Structure of biomolecules)