Pishchal'nikov R Iu, Razzhivin A P
Belozerskii Research Institute of Physicochemical Biology, Lomonosov State University, Vorob'evy Gory, Moscow, 119992 Russia.
Biofizika. 2003 Mar-Apr;48(2):221-6.
Absorption and circular dichroism spectra of two forms of the peripheral light-harvesting complex from photosynthetic purple bacteria Rhodopseudomonas acidophila were calculated. Calculations were carried out on the basis of exciton theory for circular aggregates of bacteriochlorophyll molecules and X-ray data for these forms of the complex. It was shown that theoretical spectra fit well experimental ones at the same values of excitation energy, homogeneous and inhomogeneous broadening, and bandwidth for all bacteriochlorophyll molecules of complexes. To approximate the circular dichroism spectra of complexes, it was necessary to change the orientations and the values of the moments of transition of Qy molecules relative to their orientation determined on the basis of X-ray structure analysis data.
计算了光合紫色细菌嗜酸红假单胞菌外周光捕获复合物两种形式的吸收光谱和圆二色光谱。计算是基于细菌叶绿素分子圆形聚集体的激子理论以及这些复合物形式的X射线数据进行的。结果表明，在相同的激发能量、均匀和非均匀展宽以及复合物所有细菌叶绿素分子的带宽值下，理论光谱与实验光谱拟合良好。为了近似复合物的圆二色光谱，有必要改变Qy分子跃迁矩的方向及其基于X射线结构分析数据确定的方向值。
