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Evidence for Two Spectroscopically Different Dimers of Light-Harvesting Complex I from Green Plants

机译：来自绿色植物的两种光谱不同二聚体的证据

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摘要

A preparation consisting consisting of isolated dimeric peripheral antenan complexes fromgreen plant photosystem I(light-harvesting complex I or LHCI)has been characterized by means of (polarized steadystate absorption and fluorescence spectroscopy at low temperatures. We show that this preparation can be described reasonably welll by a mixture of two types of dimers. In the first dimer about 10% of all Q_y absorption of the chlorophylls arises from two chlorophylls with absorption and emission maxima at about 711 and 733 nm, respectively,whereas in the second about 10% of the absorption arises from two chlorophulls with absorption and emission maxima at about 693 and 702 nm, respectvely. The remaining chlorophylls show spectroscopic properties comparable to those of the related peripheral antenna complexes of photosystem II. We attribute the first dimer to a heterodimer of thre Lhcal and Lhca4 proteins and the second to a hetero- or homodimer of the Lhca2 and/or Lhca3 proteins. We suggest that the chlorophylls responsible for the 773 nm emission (F-730) and 702 nm emission (F-702) are excitonicaly coupled diemrs and that F-730 originates from one of the strongest coupled pair fo chlorophylls observed in nature.
机译：通过（低温下的偏振稳定态度吸收和荧光光谱法，其特征在于，由来自植物光系统I（光收获的复合物I或LHCI）组成的制剂。通过两种类型的二聚体的混合物。在叶绿素的所有Q_Y吸收的第一二聚体中，分别在约711和733nm的吸收和发射最大值的两个叶绿素中产生叶绿素，而在该约10％的约10％吸收从两个氯检查中产生的吸收和发射最大值，尤其是693和702nm。剩余的叶绿素显示出与照相周边天线复合物的光谱性质相当。我们将第一二聚体归因于Thre Lhcal的异二聚体LHCA4蛋白质和第二次蛋白质和/或LHCA3蛋白的杂种或同型二聚体。我们sug最可爱的是，对773nm发射（F-730）和702nm发射（F-702）负责的叶绿素是兴奋性偶联的二聚体，并且F-730源自本质上观察到的最强耦合对的叶绿素之一。

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