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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >TEMPORALLY AND SPECTRALLY RESOLVED SUBPICOSECOND ENERGY TRANSFER WITHIN THE PERIPHERAL ANTENNA COMPLEX (LH2) AND FROM LH2 TO THE CORE ANTENNA COMPLEX IN PHOTOSYNTHETIC PURPLE BACTERIA
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TEMPORALLY AND SPECTRALLY RESOLVED SUBPICOSECOND ENERGY TRANSFER WITHIN THE PERIPHERAL ANTENNA COMPLEX (LH2) AND FROM LH2 TO THE CORE ANTENNA COMPLEX IN PHOTOSYNTHETIC PURPLE BACTERIA

机译：在光合紫色细菌的周围天线复合体（LH2）内以及从LH2到核心天线复合体的时间分辨和光谱分辨的亚次能量转换

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摘要

We report studies of energy transfer from the 800-nm absorbing pigment (B800) to the 850-nm absorbing pigment (B850) of the LH2 peripheral antenna complex and from LH2 to the core antenna complex (LH1) in Rhodobacter (Rb.) sphaeroides. The B800 to B850 process was studied in membranes from a LH2-reaction center (no LH1) mutant of Rb. sphaeroides and the LH2 to LH1 transfer was studied in both the wild-type species and in LH2 mutants with blueshifted B850. The measurements were performed by using approximate to 100-fs pulses to probe the formation of acceptor excitations in a two-color pump-probe measurement. Our experiments reveal a B800 to B850 transfer time of approximate to 0.7 ps at 296 K and energy transfer from LH2 to LH1 is characterized by a time constant of approximate to 3 ps at 296 K and approximate to 5 ps at 77 K. In the blue-shifted B850 mutants, the transfer time from B850 to LH1 becomes gradually longer with increasing blue-shift of the B850 band as a result of the decreasing spectral overlap between the antennae. The results have been used to produce a model for the association between the ring-like structures that are characteristic of both the LH2 and LH1 antennae.
机译：我们报告了在球形红球菌（Rb。）球形中从800 nm吸收颜料（B800）到850 nm吸收颜料（B850）的能量转移以及LH2到核心天线复合物（LH1）的能量转移的研究。 。从Rb的LH2反应中心（无LH1）突变体的膜中研究了B800到B850的过程。在野生型物种和蓝移B850的LH2突变体中都研究了球菌和LH2到LH1的转移。通过使用大约100 fs的脉冲来进行测量，以探测双色泵浦探针测量中受体激发的形成。我们的实验表明，B800到B850在296 K时的传输时间约为0.7 ps，从LH2到LH1的能量传输的特征在于时间常数在296 K时约为3 ps，在77 K时约为5 ps。对于B850突变体，由于天线之间频谱重叠的减少，随着B850波段蓝移的增加，从B850到LH1的转移时间逐渐变长。该结果已用于生成一个模型，用于同时具有LH2和LH1天线特征的环状结构之间的关联。

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