变藻蓝蛋白发色团之间激子相互作用

EXCITON INTERACTIONS AMONG CHROMOPHORES IN ALLOPHYCOCYANIN

本文尝试性地建立了ＡＰＣ（αβ）３内内层部分具有Ｃ３群对称特性的三个β发色团之间的“三聚体”激子相互作用的模型，依据“三聚体”激子相互作用的光谱表征，通过对ＡＰＣ（αβ）３的吸收光谱和ＣＤ谱的解叠，分析和计算得到ＡＰＣ（αβ）３内β发色团之间的距离，以及在坐标中的相对位置，估算了激发能在三个激子态之间的去局域时间．

An alterative exciton model has been firstly described, where three identical β chromophores at inner of the allophycocyanin (αβ)3 disk with C3-symmetry and brought close togather and coupled by strong exciton mechanism. Meanwhile, accurate absorption and circular dichroism (CD) spectra of allophycocyanin (αβ)3、 (αβ),as well as a andβ subunits are obtained, and analyzed by deconvolution methods. The deconvolutionresults of these observed spectra togather with ths theoretical analysis of the exciton model have taken an estimate of the relative chromophore orientations of the transition dipole moments. The exciton splitting energy and the distance of adjacent βchromophores in allophycocyanin (αβ)3 have also been deduced in this paper.